A spectroscopic analysis of the most polarizing atomic lines of the second solar spectrum

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Volume 495 / No 2 (February IV 2009)

A&A, 495 2 (2009) 577-586

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Table 1:

Table of the most polarizing atomic spectral lines of the second solar spectrum (3160 Å-6995 Å). The lines are listed by increasing wavelength. The various quantities that are listed for each line are described in Sect. 2.3.
#	$\lambda^{\rm Sun}$	Elem.	W $_{\lambda}$	W $_{\lambda}$ / $\lambda$	$(Q/I)^{\rm M}$	$(Q/I)^{\rm m}$	Q/I	Type	Notes
	(Å)		(mÅ)	(F)	$\;$ (%)	$\;$ (%)	(%)
--------------- Volume III ---------------
1	3179.342	Ca II	580	182	0.85	0.50	0.35	W	¹
2	3217.935	Ti I	35	11.1	0.75	0.60 $^{\ast }$	0.15	S $^{\ast }$	²
3	3230.592	Sm II	34	10.5	0.86	0.65 $^{\ast }$	0.21	S $^{\ast }$	³
4	3234.518	Ti II	49	15.2	0.62	0.50	0.12	M1	⁴
					1.35	0.85	0.50
5	3242.007	Ti II	270	83.0	0.95	0.80	0.15	M1
					1.07	0.84	0.23
6	3247.569	Cu I	246	76.0	1.75	0.82	0.93	M0	⁵
7	3248.612	/Ti II Ti I	148	46.0	0.57	0.40	0.17	W	⁶
8	3260.552	Nb II	20	6.1	0.85	0.70 $^{\ast }$	0.15	S
9	3273.052	Zr II	78	23.9	0.77	0.58	0.19	W
10	3273.972	Cu I	221 $^{\ast }$	67.4	0.36	0.19	0.17	W	⁷
11	3308.399	Ti I	32	9.7	0.92	0.58 $^{\ast }$	0.34	S
12	3322.949	Ti II (Zr II)	495 $^{\ast }$	157.3	0.42	0.27	0.15	M1	⁸
					0.75	0.64	0.11
13	3326.777	//Ti II-Zr II	214	64.0	0.275	0.175	0.100	W
14	3372.812	Ti II	459	135.9	0.67	0.55	0.12	M0
15	3380.260	Ti II	30	31.2	0.25	0.15	0.10	W	⁹
16	3380.585	Ni I	809	239	0.275	0.175	0.100	W	⁹
17	3383.765	Ti II	430 $^{\ast }$	127	0.65	0.53	0.12	M0
18	3391.973	Zr II	113 $^{\ast }$	20.0	0.42	0.32	0.10	W
19	3405.126	Co I	206	60.5	0.67	0.49	0.18	M0
20	3407.805	Dy II	60	18.8	0.42	0.32 $^{\ast }$	0.10	S $^{\ast }$
21	3433.579	//Ni I-Cr I	492	143	0.25	0.15	0.10	W
22	3439.229	Gd II	10	3.5	0.53	0.40 $^{\ast }$	0.13	S
23	3446.271	Ni I	470	136	0.335	0.235	0.100	M1	¹⁰
					0.575	0.435	0.14
24	3452.905	Ni I	247	73.1	0.41	0.22	0.19	W
25	3453.512	Co I	310	87.9	0.36	0.24	0.12	W	¹¹
26	3458.467	Ni I	656	189	0.28	0.14	0.14	M1
					0.60	0.42	0.18
27	3461.667	Ni I	758	219	0.33	0.16	0.17	W	¹⁰
28	3464.474	Sr II (Fe II)	63	18.2	0.44	0.32 $^{\ast }$	0.12	S
29	3465.766	Co I	69	84.2	0.240	0.125	0.115	W	¹²
30	3465.880	Fe I	544	158	0.26	0.15	0.11	W	¹²
31	3469.493	Ni I (V II)	180	52.2	0.27	0.15	0.12	W
32	3472.558	Ni I	374	136	0.31	0.175	0.135	W
33	3476.712	Fe I	465	136	0.34	0.19	0.15	W
34	3485.110	Ni I	100	29.2	0.33	0.23 $^{\ast }$	0.10	S $^{\ast }$
35	3492.975	Ni I	826	239	0.25	0.15	0.10	W
36	3494.515	/Cr II Dy II	46	13.2	0.375	0.26 $^{\ast }$	0.115	S $^{\ast }$	¹³
37	3504.892	Fe I /Ti II	132	37.6	0.36	0.22	0.14	W
38	3510.846	Ti II	87	29.1	0.40	0.28 $^{\ast }$	0.12	S
39	3515.066	Ni I	718	202	0.22	0.10	0.12	W
40	3519.618	Zr I	7.5	2.6	0.36	0.23 $^{\ast }$	0.13	S
41	3521.270	Fe I	381	110	0.24	0.11	0.13	W
42	3533.014	Fe I	97	31.4	0.35	0.20	0.15	W	¹⁴
43	3550.222	-Dy II	43	12.0	0.42	0.31	0.11	S	¹⁵
44	3553.095	Pd I	48 $^{\ast }$	3.4	0.385	0.20 $^{\ast }$	0.185	S	¹⁶
45	3554.937	Fe I	404	111	0.21	0.11	0.10	W
46	3556.597	Zr II	23	7.0	0.32	0.18 $^{\ast }$	0.14	S
47	3558.532	/Fe I-Sc II	485	137	0.23	0.05	0.18	W
48	3565.396	Fe I	990	274	0.20	0.08	0.12	W	¹⁷
49	3566.383	Ni I	458	141	0.32	0.22	0.10	M1	¹⁷
					0.38	0.30	0.08
50	3570.134	Fe I	1380	387	0.34	0.20	0.14	M1
					0.41	0.29	0.12
51	3578.693	Cr I	488	142	0.42	0.17	0.25	M1
					0.435	0.285	0.150
52	3581.209	Fe I	2144	599	0.34	0.18	0.16	M1
					0.41	0.28	0.13
53	3585.714	Fe I	168	63.0	0.22	0.11	0.11	W	¹⁸
54	3585.844	Co I?-Ti I	25	22.6	0.40	0.26 $^{\ast }$	0.14	S	¹⁸
55	3586.990	Fe I	532	147	0.22	0.09	0.13	W
56	3589.222	Ru I	18	5.7	0.375	0.275	0.100	S
57	3590.489	Sc II	136	37.9	0.21	0.05	0.16	M1	¹⁹
					0.375	0.275	0.100
58	3592.027	V II	75	21.0	0.20	0.10	0.10	W
59	3593.495	Cr I	436	127	0.775	0.270	0.505	M1
					0.95	0.27	0.68
60	3594.638	Fe I	146	40.8	0.30	0.17	0.13	W
61	3594.876	Co I	92	25.7	0.25	0.14	0.11	W
62	3596.054	Ti II	95	26.7	0.21	0.07	0.14	W	²⁰
63	3597.712	Ni I	181	50.2	0.29	0.12	0.17	M1	²¹
					0.36	0.27	0.09
64	3600.739	Y II	69	19.2	0.35	0.25	0.10	W	²²
65	3601.198	Zr I	13	3.6	0.42	0.31 $^{\ast }$	0.11	S
66	3602.287	Ni I	94	26.2	0.18	0.06	0.12	W
67	3605.339	//Cr I Co I	495	136	0.24	0.09	0.15	W
68	3608.869	Fe I	1046	287	0.31	0.18	0.13	M1
					0.44	0.26	0.18
69	3610.166	//Fe I Ti I	231	65.4	0.26	0.11	0.15	W
70	3610.460	Ni I	250 $^{\ast }$	52.0	0.27	0.08	0.19	W
71	3618.777	Fe I	1410	385	0.39	0.15	0.24	M1	²³
					0.35	0.25	0.10
72	3619.400	Ni I	568	204	0.30	0.16	0.14	W
73	3621.467	Fe I	140	40.6	0.19	0.09	0.10	W
74	3624.733	Ni I	132	37.1	0.165	0.04	0.125	W
75	3631.475	//Fe I Cr II	1364	369	0.21	0.11	0.10	M1
					0.31	0.24	0.07
76	3633.138	Y II	134 $^{\ast }$	19.0	0.51	0.24	0.27	S
77	3647.851	Fe I (Fe I)	970	313	0.28	0.11	0.17	M1
					0.31	0.23	0.08
78	3651.800	Sc II	114	39.1	0.14	0.04	0.10	W
79	3664.097	Ni I	130	43.8	0.19	0.08	0.11	W
80	3674.150	Ni I	178 $^{\ast }$	33.0	0.16	0.06	0.10	W
81	3694.817	Dy II	24	9.2	0.30	0.20 $^{\ast }$	0.10	S
82	3705.577	Fe I	562	180	0.15	0.05	0.10	W
83	3710.292	Y II	74	27.2	0.40	0.25 $^{\ast }$	0.15	S
84	3719.947	Fe I	1664	538	0.34	0.24	0.10	M0	²⁴
85	3724.574	Ti I	60	23.1	0.475	0.320	0.155	S
86	3728.042	Ru I	40	20.0	0.30	0.20 $^{\ast }$	0.10	S $^{\ast }$	²⁵
87	3733.841	Cr I?	2	2.3	0.57	0.42	0.15	S	²⁶
88	3734.874	Fe I	3027	945	0.480	0.275	0.205	W	²⁷
89	3737.141	Fe I	1071	428	0.31	0.16	0.15	W
90	3741.312	Sm II-Eu II	13	5.0	0.57	0.38 $^{\ast }$	0.19	S	²⁸
91	3742.278	Ru I	6	2.4	0.50	0.375 $^{\ast }$	0.125	S
92	3743.368	Fe I	592	193	0.275	0.175	0.100	W
93	3745.574	Fe I	1202 $^{\ast }$	459	0.325	0.200	0.125	W
94	3745.910	Fe I (Zr II)	540	301	0.575	0.280 $^{\ast }$	0.295	S	²⁹
95	3748.271	Fe I	497	228	0.32	0.18	0.14	W
96	3748.966	/Fe I Cr I	103	82.9	0.275	0.175	0.100	W
97	3749.495	Fe I	1907	578	0.45	0.20	0.25	W
98	3753.620	/Fe I-Ti I	132	45.0	0.16	0.30	0.14	W	³⁰
99	3758.245	Fe I	1647	497	0.40	0.22	0.18	M1
					0.69	0.42	0.27
100	3759.299	Ti II	334	115	0.41	0.31	0.10	W	³¹
101	3761.320	Ti II	277 $^{\ast }$	61.0	0.48	0.38	0.10	M1
					0.70	0.41	0.29
102	3763.803	Fe I	829	255	0.36	0.15	0.21	M1	³²
					0.72	0.40	0.32
103	3767.204	Fe I	820	262	0.28	0.18	0.10	M1
					0.55	0.40	0.15
104	3780.516	/CN-Zr I	26	9.5	0.51	0.39	0.12	S	³³
105	3782.318	CN /Y II	18	6.3	0.485	0.385	0.100	S
106	3784.252	Nd II-Fe I p	16	5.8	0.65	0.38	0.27	S	³⁴
107	3787.236	V II CN	139 $^{\ast }$	17.2	0.50	0.38	0.12	S
108	3788.861	/Cr I-CN	69 $^{\ast }$	17.4	0.59	0.38	0.21	S
109	3791.194	CN Nb I	8.5	3.2	0.50	0.38	0.12	S
110	3792.565	/CN Y II	33	15.0	0.67	0.38	0.29	S
111	3796.974	CN Cr I	20	16.1	0.540	0.375	0.165	S
112	3801.371	Fe I-CN	75	30.2	0.550	0.375	0.175	S
113	3801.542	Ce II CN	50	21.0	0.575	0.375	0.200	S
114	3806.375	CN Fe I	67	22.0	0.63	0.37	0.26	S
115	3807.937	/Cr I-CN	111	35.2	0.52	0.39 $^{\ast }$	0.13	S	³⁵
116	3809.162	Fe I	24	9.5	0.62	0.37	0.25	S	³⁶
117	3811.380	CN Ti I?	35	16.0	0.64	0.37	0.27	S
118	3812.199	CN Y II	44 $^{\ast }$	4.5	0.51	0.37	0.14	S
119	3813.491	V I	54	28.4	0.49	0.36	0.13	S	³⁷
120	3814.892	CN Ti I	26	15.7	0.58	0.36	0.22	S
121	3817.843	V I CN Cr I	40	16.0	0.50	0.36	0.14	S
122	3824.750	CN Fe I p	11	10.5	0.31	0.20 $^{\ast }$	0.11	S $^{\ast }$
123	3826.770	CN-V I Ni I	15	11.2	0.48	0.35	0.13	S
124	3826.957	CN-/V II	32	21.7	0.47	0.35	0.12	S
125	3829.365	Mg I	874	308	0.50	0.26	0.24	M1	³⁸
126	3830.311	CN? Sm II	7.5	3.8	0.49	0.35	0.14	S	³⁹
127	3832.310	Mg I	1685	600	0.225	0.10	0.125	M1	³⁸
128	3838.302	Mg I	1920	641	0.27	0.16	0.11	M1	³⁸
129	3846.986	CN-Zr I	110 $^{\ast }$	9.6	0.435	0.335	0.10	S
130	3848.611	CN Ce II	41	13.5	0.470	0.335	0.135	S	⁴⁰
131	3851.172	V I CN	24	9.6	0.50	0.335	0.165	S
132	3851.599	CN Fe I	13	6.1	0.565	0.330	0.235	S
133	3867.863	CN Ru I	100 $^{\ast }$	1.6	0.500	0.325	0.175	S
134	3869.313	Ti I-CN	120 $^{\ast }$	22.5	0.475	0.320	0.155	S
135	3870.552	CN Co I	74 $^{\ast }$	19.4	0.435	0.320	0.115	S
136	3871.136	CN V I?	13	18.8	0.45	0.32	0.13	S
137	3872.179	CN Fe I?	19	12.4	0.525	0.320	0.205	S	⁴⁰
138	3883.639	Cr I	26	9.3	0.67	0.44 $^{\ast }$	0.23	S
139	3891.781	Ba II	30	11.6	0.54	0.40 $^{\ast }$	0.14	S
--------------- Volume II ---------------									⁴¹
140	3920.269	Fe I	341	101	0.50	0.15	0.35	W
141	3922.923	Fe I	414	124	0.72	0.20	0.52	W	⁴²
142	3927.933	Fe I (CH)	187	144	0.51	0.10	0.41	W
143	3933.682	Ca II [K]	20 253	4874	0.80	0.00	0.80	M1	⁴³
144	3987.966	Yb I	18	5.0	0.53	0.42 $^{\ast }$	0.11	S
145	4030.763	Mn I	326 $^{\ast }$	75.2	0.28	0.05	0.23	W	⁴⁴
146	4033.072	Mn I	229 $^{\ast }$	54.8	0.16	0.05	0.11	W	⁴⁴
147	4034.492	Mn I	213 $^{\ast }$	46.1	0.27	0.10	0.17	W
148	4039.096	Cr I	42	10.4	0.445	0.345	0.100	S
149	4040.790	Ce II-Nd II	39	9.6	0.48	0.345	0.135	S	⁴⁵
150	4045.825	Fe I	1174	316	0.465	0.190	0.275	M1
					0.73	0.34	0.39
151	4049.862	Gd II /Fe I	11	2.7	0.67	0.44 $^{\ast }$	0.23	S
152	4062.232	Ce II	6	1.5	0.49	0.33	0.16	S
153	4063.605	Fe I (Mn I)	787	219	0.34	0.08	0.26	M1
					0.50	0.33	0.17
154	4071.749	Fe I	723	191	0.41	0.16	0.25	M1	⁴⁶
					0.63	0.32	0.31
155	4077.724	Sr II	428 $^{\ast }$	100	1.225	0.320	0.905	MS
					1.10	0.32	0.78
156	4083.226	Ce II	26	6.4	0.47	0.32	0.15	S
157	4109.450	Nd II	39	9.5	0.42	0.30	0.12	S
158	4115.376	Ce II	11	2.7	0.430	0.295	0.135	S
159	4128.309	Y I	12	2.9	0.595	0.290	0.305	S
160	4129.724	Eu II	54	12.1	0.465	0.285	0.180	S
161	4130.657	Ba II	45	10.9	0.53	0.26 $^{\ast }$	0.27	S	⁴⁷
162	4142.842	Y I	22	5.3	0.445	0.280	0.165	S
163	4186.126	Ti I	42	10.0	0.53	0.27 $^{\ast }$	0.26	S
164	4222.602	Ce II	22	5.2	0.42	0.30 $^{\ast }$	0.12	S
165	4226.740	Ca I	1476	342	2.190	0.235	1.955	M1
					2.700	0.235	2.465
166	4233.612	Fe I	298	70.4	0.14	0.24	0.10	W	⁴⁸
167	4235.949	Fe I (Cr I) (Y I)	385	90.9	0.12	0.27	0.15	W	⁴⁹
168	4237.891	Ti I	16	4.0	0.38	0.23	0.15	S
169	4246.837	Sc II	171	40.3	0.460	0.225	0.235	MS	⁵⁰
					0.470	0.225	0.245
170	4250.130	Fe I	342 $^{\ast }$	79.5	0.26	0.12	0.14	W
171	4254.346	Cr I (V II)	393	92.4	0.40	0.16	0.24	M1
					0.270	0.225	0.045
172	4268.628	V I	23	5.6	0.45	0.22	0.23	S
173	4271.774	Fe I	756	177	0.24	0.09	0.15	W
174	4274.806	Cr I	196	45.8	0.59	0.22	0.37	M1
					0.36	0.22	0.14
175	4283.014	Ca I	133	31.0	0.33	0.18	0.15	W	⁵¹
176	4289.922	Fe I (Ce II)	65	19.1	0.285	0.170	0.115	S
177	4299.249	/Fe I Ti I (CH)	212	49.3	0.22	0.12	0.10	W	⁵²
178	4307.748	Ca I	59	40.2	0.14	0.04	0.10	S	⁵³
179	4307.912	/Fe I Ti II (CH)	723	165	0.14	0.04	0.10	W	⁵⁴
180	4325.775	Fe I (Fe I p)	793	174	0.32	0.12	0.20	M1
					0.380	0.195	0.185
181	4339.722	Cr I	69	23.8	0.27	0.15 $^{\ast }$	0.12	S
182	4340.475	H I [H $_{\gamma}$ ]	2855	659	0.25	0.13	0.12	W
183	4354.436	La II	13	3.4	0.295	0.195 $^{\ast }$	0.100	S	⁵⁵
184	4374.944	Y II	88	20.1	0.39	0.18	0.21	S
185	4383.557	Fe I	1008	235	0.410	0.110	0.300	M1	⁵⁶
					0.305	0.175	0.130
186	4404.761	Fe I	898	181	0.29	0.06	0.23	M1
					0.23	0.17	0.06
187	4415.135	Fe I	417 $^{\ast }$	92.9	0.07	0.20	0.13	W
188	4425.444	Ca I	145	31.6	0.275	0.165	0.110	S
189	4431.292	Ti I	5	1.1	0.38	0.16	0.22	S	⁵⁷
190	4453.710	Ti I	36	9.0	0.280	0.155	0.125	S
191	4460.225	Ce II	100 $^{\ast }$	6.0	0.315	0.155	0.160	S	⁵⁸
192	4462.993	Nd II	13	2.9	0.26	0.15	0.11	S
193	4471.244	Ti I (Ce II)	35	8.5	0.265	0.165 $^{\ast }$	0.100	S
194	4486.914	Ce II	11	2.5	0.28	0.15	0.13	S
195	4500.288	Cr I	39 $^{\ast }$	6.2	0.230	0.145	0.085	S
196	4511.900	Cr I	31	8.4	0.180	0.125 $^{\ast }$	0.055	S
197	4527.325	//Ti I /Cr I (Ce II)	67	14.8	0.210	0.140	0.070	S
198	4536.054	Ti I	147 $^{\ast }$	16.3	0.240	0.125 $^{\ast }$	0.115	S
199	4540.710	Cr I	52	12.3	0.165	0.110 $^{\ast }$	0.055	S
200	4554.036	Ba II	159	36.7	0.78	0.13	0.65	MS
					0.50	0.13	0.37
201	4572.284	Ce II	15	3.3	0.205	0.130	0.075	S
202	4595.593	Cr I	21	4.6	0.255	0.105 $^{\ast }$	0.150	S
203	4599.227	Ti I	6	1.3	0.185	0.120	0.065	S
204	4607.338	Sr I	36	7.8	1.200	0.120	1.080	S
--------------- Volume I ---------------									⁵⁹
205	4639.368	Ti I	36	8.4	0.185	0.115	0.070	S
206	4639.946	Ti I	31	7.3	0.175	0.115	0.060	S
207	4679.983	Fe I p	6.5	1.4	0.155	0.105	0.050	S
208	4703.003	Mg I	326	71.9	0.095	0.045	0.050	W
209	4742.798	Ti I	27	5.7	0.290	0.098	0.192	S
210	4758.124	Ti I	40	8.2	0.202	0.095	0.107	S
211	4759.276	Ti I	41	8.6	0.192	0.095	0.097	S
212	4778.258	Ti I	16	3.3	0.148	0.092	0.056	S
213	4796.189	Cr I-//Ti I	24	5.0	0.145	0.090	0.055	S
214	4799.794	V I-//Ti I	75 $^{\ast }$	10.2	0.175	0.089	0.086	S
215	4805.420	Ti I	37	7.7	0.150	0.087	0.063	S
216	4840.884	Ti I	60	12.6	0.136	0.082	0.054	S	⁶⁰
217	4868.263	Ti I	26	5.5	0.130	0.080	0.050	S
218	4975.351	Ti I	35 $^{\ast }$	3.6	0.165	0.070	0.095	S	⁶¹
219	5021.923	Cr I Fe I C2	22	4.4	0.115	0.065	0.050	S
220	5025.764	Fe I C2	11	2.2	0.124	0.063	0.061	S
221	5112.279	Zr II	8	1.6	0.106	0.056	0.050	S
222	5113.127	/Cr I MgH	23	4.5	0.120	0.056	0.064	S
223	5115.790	Fe I	23	4.5	0.120	0.056	0.064	S	⁶²
224	5120.420	Ti I	31	6.0	0.135	0.055	0.080	S	⁶³
225	5138.717	Cr I-MgH	13	2.4	0.130	0.055	0.075	S
226	5139.648	Cr I	46	8.9	0.120	0.054	0.066	S	⁶⁴
227	5146.119	Fe II p C2	37	6.6	0.140	0.054	0.086	S	⁶⁵
228	5149.796	Co I MgH	11	2.1	0.126	0.053	0.073	S
229	5153.241	Cu I	56 $^{\ast }$	8.5	0.163	0.053	0.110	S	⁶⁶
230	5167.327	Mg I	935 $^{\ast }$	173	0.130	0.030	0.100	W
231	5171.028	Ru I MgH	5	1.0	0.110	0.052	0.058	S
232	5176.792	/V I-MgH	10	1.9	0.115	0.051	0.064	S
233	5196.452	Cr I	34	6.5	0.090	0.040 $^{\ast }$	0.050	S	⁶⁷
234	5206.044	Cr I (Ti I)	216 $^{\ast }$	36.6	0.115	0.050	0.065	MS	⁶⁸
					0.115	0.050	0.065
235	5208.432	Cr I	247	47.4	0.110	0.040	0.070	MS	⁶⁸
					0.077	0.050	0.027
236	5218.209	Cu I	48	9.8	0.101	0.049	0.052	S
237	5239.823	Sc II	55	10.5	0.117	0.048	0.069	S
238	5387.565	Cr I	25 $^{\ast }$	1.8	0.100	0.040	0.060	S	⁶⁹
239	5528.418	Mg I	293	53.8	0.052	0.000	0.052	W
240	5535.51	Ba I	113 $^{\ast }$		0.165	0.032	0.133	S
241	5565.485	Ti I	16	2.9	0.150	0.031	0.119	S
242	5598.491	Ca I	118	21.1	0.080	0.030	0.050	S
243	5644.146	Ti I	29	5.1	0.260	0.029	0.231	S
244	5889.973	Na I [D₂]	752 $^{\ast }$	120	0.330	0.021	0.309	MS
					0.220	0.021	0.199
245	5895.940	Na I [D₁]	564 $^{\ast }$	91.0	0.05	-0.02	0.07	-	⁷⁰
246	6024.068	Fe I	117 $^{\ast }$	19.8	0.060	0.010 $^{\ast }$	0.050	S
247	6141.727	/Ba II-Fe I	113	19.4	0.059	0.000	0.059	W
248	6562.808	H I [H $_{\alpha }$ ]	4020	649	0.120	0.010	0.110	S	⁷¹

¹ The linear polarization signal is quite noisy at this wavelength, and it is not possible to measure the amplitude of the Q/I profile with high precision. There are four more lines in this spectral region that, although showing linear polarization peaks with amplitudes apparently larger than 0.1%, have not been included in this table because of the high noise level: Fe I at 3171.665 Å, //Fe I at 3172.051 Å, Cr II Fe I p (CH) at 3172.087 Å, and Fe I at 3180.236 Å.
² The polarization peak does not fall exactly at line center. This could be due to the fact that the line is severely blended with a depolarizing Ni I line at 3217.841 Å, which may imply also a reduction of the peak amplitude.
³ This signal is a typical case where it is not easy to establish the reference level from which the amplitude of the Q/I peak has to be measured.
⁴ This signal has been associated with the Ti II line since the Q/I central peak falls at the wavelength position of the line-core of this spectral line, and because it is very similar to the signal produced by the Ti II line at 3242.007 Å, which belongs to the same multiplet. However, the strong polarization signal in the wings may be produced by the combined action of this line and of the nearby line at 3234.647 Å (Ni I-Fe I).
⁵ This is a very deep line in the intensity spectrum, and unavoidably the polarization signal is rather noisy at line center. For this reason it is not easy to determine if it has to be classified as ``M0'' or ``M1''. The polarization lobe in the blue wing of the line is almost completely destroyed by the presence of depolarizing blended lines.
⁶ The ``W'' shape of this signal might be due to the effect of depolarizing lines blended with the red and blue wings of this spectral line.
⁷ The polarization peak does not fall exactly at line center. This displacement, as well as the large width of the intensity profile of this line, could be explained by the presence of a blend with an OH line, or in terms of the hyperfine structure shown by this element.
⁸ The depolarization observed beside the line-core peak of this line might be affected by the presence of blended lines. Moreover, it is not possible to exclude that the polarization observed in the far wings could be affected (or due) to the NH band. In this latter case the signal should be classified as ``W''.
⁹ These lines are severely blended. The larger reduced equivalent width of the Ni I line suggests that the broad depolarization is due to this line, while the Ti II line produces a much narrower ``W'' signal.
¹⁰ The polarization peak at line center shows a substructure made of two secondary peaks separated by a small dip.
¹¹ It is not possible to exclude that this signal might be of type ``M1'', the wing-peaks being hidden by blended lines.
¹² These lines are severely blended, and it is difficult to understand if they are both ``W'', or if only one is ``W'', the other one being ``S''.
¹³ The polarization peak does not fall exactly at line center.
¹⁴ This line falls in the blue depolarizing wing of a Fe I line, and it is not easy to determine if this signal has to be classified as ``S'' or ``W''.
¹⁵ The polarization peak has quite a large width. This could be due to the unidentified blended line, or to the hyperfine structure shown by this element. This second hypothesis is supported by the similarity with the polarization signal of the Dy II line at 3407.805 Å.
¹⁶ It is not easy to establish the reference level from which the amplitude of the Q/I peak has to be measured.
¹⁷ It is not possible to exclude that the polarization peak at 3566.7 Å $\;$ could be due to the interferences between the Fe I lines at 3565.396 Å $\;$ and 3570.134 Å, which belong to the same multiplet. In this case the Fe I signal should be classified as ``M1'' instead of ``W'', while the Ni I signal as ``W'' instead of ``M1''.
¹⁸ The width of the polarization peak at the wavelength position of the Co I-Ti I line (line # 54) is a little surprising. It is not possible to exclude that this peak might pertain to a possible ``M1'' structure of the Fe I line at 3585.714 Å. In this case, the Co I-Ti I line should be excluded.
¹⁹ In the blue wing of this line the polarization might be enhanced by (or due to) the presence of a blending Fe I line at 3590.302 Å, in the red wing it could be affected by the wing-lobe of the far, strong Cr I line at 3593.495 Å. It is difficult, therefore, to determine if this line should be classified as ``M1'', or ``W''.
²⁰ Very likely the polarization in the blue wing is due to the strong Cr I line at 3593.495 Å, while in the red wing to the Ni I line at 3597.712 Å. If this is not the case, the signal should be classified as ``M1''.
²¹ It is not possible to exclude that the polarization in the far wings of this line might be the wing-lobes of the far Cr I line at 3593.495 Å. In this case the signal should be classified as ``W''.
²² The polarization lobes in the far wings do not seem to be due to this line. If this is not the case, the signal should be classified as ``M1''.
²³ We have classified this signal as ``M1'', since its wing-lobes appear to be severely blended by several depolarizing lines.
²⁴ This line produces a very broad polarization signal. The amplitude of the wing-lobes has been measured in the blue wing at 3717.0 Å.
²⁵ The polarization peak does not fall exactly at line center, being slightly shifted to the blue.
²⁶ This polarization signal, though being located at the wavelength position corresponding to a (possible) Cr I line, might be due either to CN or to the strong, nearby Fe I line at 3734.874 Å.
²⁷ It is not possible to exclude that the signal at 3733.841 Å (# 87) might be due to this Fe I line. In this case this signal should be classified as ``M1'' instead of ``W''.
²⁸ The polarization peak does not fall exactly at line center, being slightly shifted to the blue. This may indicate that the signal is due to Sm II.
²⁹ This signal falls in the depolarizing wing of the broad Fe I line at 3745.574 Å (belonging to the same multiplet), and it is difficult to determine if this is a ``S'' or a ``W'' signal.
³⁰ The dip in the red wing, which is free of blends, induces to believe that this is a ``W'' signal, the dip in the blue wing being missing because of the blend with the Dy II-CN line at 3753.525 Å.
³¹ This signal falls in the strongly polarized red wing of the Fe I line at 3758.245 Å, and it is not possible to exclude that it might be classified as an ``M'' signal. Note that the Ti II line at 3761.320 Å (classified as ``M1'') belongs to the same multiplet.
³² The amplitude of the wing-lobe might be enhanced by the presence of CN lines.
³³ The polarization peak does not fall exactly at line center, but it is slightly shifted to the blue. This may be an indication that the signal is due to CN.
³⁴ Given the extremely low value of the Einstein coefficient of the Fe I line ( $2\times10^3$ s^-1), it seems quite reasonable to believe that this signal is produced by the Nd II line.
³⁵ The polarization peak does not fall exactly at line center, but it is slightly red-shifted. This is a strong hint that this signal might be due to CN.
³⁶ The polarization peak does not seem to be as sharp as for an isolated line. Probably there is a contribution coming from the CN molecule.
³⁷ The width of this polarization signal suggests that it might be enhanced by (or due to) the strongly blending Ti II line at 3813.394 Å. It is not possible to exclude therefore that the Ti II line should be included in the table, and classified as ``M0''.
³⁸ The wing-lobes of these lines are probably heavily affected (enhanced) by several CN lines. For this reason the wing-lobe amplitudes have not been measured.
³⁹ The polarization signal is severely blended with other CN lines.
⁴⁰ The polarization peak does not fall exactly at line center, but is somewhat red-shifted.
⁴¹ Volume III of the atlas covers the spectral interval between 3160 Å and 3915 Å, Vol. II the spectral interval between 3910 Å and 4630 Å. The spectral interval between 3910.0 Å and 3913.5 Å is covered by both volumes. Comparing the observations made in this spectral interval, it can be noticed that the theoretical continuum plotted in Vol. III is slightly lower than in Vol. II, while the peaks observed in Q/I in Vol. III are slightly larger than in Vol. II. This might be due to the fact that, although the nominal position of the slit is $\mu=0.1$ for the observations of both atlases, because of the seeing the ``effective'' position might be different from the nominal value.
⁴² At line center this signal shows quite a complex profile, with several secondary peaks and dips.
⁴³ At line center the Ca II K line shows a ``M'' type profile, but it is important to note that quantum interferences between the Ca II H and K lines produce a much broader signal that starts in the far blue wing of the K line, at about 3890 Å, with a positive lobe. The polarization becomes negative between the K and H lines, and it is zero (without showing any particular structure) at the wavelength position of the H line. This structure (which does not enter the classification scheme proposed in this work) has already been explained in terms of quantum interferences by Stenflo (1980) and Landi Degl'Innocenti & Landolfi (2004). It is quite surprising, however, that the atlas does not show any positive lobe in the red wing of the Ca II H line, predicted on the other hand by the theory. This might be due to the choice of the level of the local polarized continuum, which may be wrong between 3972 Å and 3990 Å. Note that where the polarization is negative, a depolarizing line produces a Q/I peak. For this reason, all the lines producing polarization peaks in this spectral interval have not been included in the table. Note also that three lines (Sc I, V I and Co I), falling within an interval of $\approx$ 0.5 Å centered at the core of the Ca II K line, are listed as masked lines by Moore et al. (1966).
⁴⁴ At line center this signal shows quite a complex profile with several secondary peaks and dips, perhaps due to hyperfine structure.
⁴⁵ The polarization signal is slightly blue-shifted with respect to line center.
⁴⁶ At line center this signal shows quite a complex profile with several secondary peaks and dips.
⁴⁷ This line is severely blended with a weaker Ce II line. In the absence of this blend, the amplitude of Q/I peak might be different.
⁴⁸ At line center this signal shows quite a complex profile with several secondary peaks and dips.
⁴⁹ It is not possible to exclude that the ``W'' shape of this signal could be due to the depolarization produced by several blending lines.
⁵⁰ The polarization profile shows a complex structure (that might be due to hyperfine structure), and an extended blue wing.
⁵¹ The depolarization in the blue wing of this profile is rather peculiar. For this reason the reference level for measuring the signal amplitude has been taken in the dip of the red wing.
⁵² It is difficult to measure the amplitude of this signal because of the presence of several blends.
⁵³ It is difficult to decide whether this line has to be classified as ``S'' or ``W'' because of the blend with the /Fe I Ti I (CH) line at 4307.912 Å, and because the polarization signal is quite noisy around this wavelength.
⁵⁴ At line center this line shows a two-peak structure, probably due to the blend.
⁵⁵ The polarization peak does not fall exactly at line center, probably because of the presence of a strong blend with a Mg I line. It is not possible to exclude that in the absence of this blend, the Q/I peak amplitude would have been significantly larger.
⁵⁶ At line center this line shows a complex structure, with several secondary peaks and dips.
⁵⁷ This line is severely blended with a Sc II line. In the absence of this blend the amplitude of the Q/I signal might be larger.
⁵⁸ This line is severely blended with a V I line. In the absence of this blend the amplitude of the Q/I signal might be larger.
⁵⁹ Volume II of the atlas covers the spectral interval between 3910 Å and 4630 Å, Vol. I the spectral interval between 4625 Å and 6995 Å. The spectral interval between 4624 Å and 4626.5 Å is covered by both volumes. Comparing the observations made in this spectral interval, it can be noticed that the depolarization produced by two rather intense lines (Fe I and Cr I) is larger in Vol. I than in Vol. II. As already discussed in the note 41, this might be due to the fact that, although the nominal position of the slit is $\mu=0.1$ for the observations of both atlases, because of the seeing the ``effective'' position might be different from the nominal value.
⁶⁰ A secondary peak is observed to the blue of line center. The observation in this spectral region is quite noisy, and at this level it is not possible to exclude that the signal could be of ``W'' type.
⁶¹ This line is severely blended with a Fe I line. In the absence of this blend the amplitude of the Q/I signal might be larger.
⁶² This line has an extremely weak Einstein coefficient (5.15 $\times$ 10⁴ s^-1), and it is not possible to exclude that this polarization signal might be due to a C₂ line.
⁶³ The polarization peak does not fall exactly at line center, probably because of the presence of a strong blend with a Fe II p C₂ line. It is not possible to exclude that in the absence of this blend, the Q/I peak amplitude would have been larger.
⁶⁴ This line is severely blended with a Fe I line. In the absence of this blend the amplitude of the Q/I signal might be larger.
⁶⁵ This polarization signal is quite wide. This may be due to the presence of a blending C₂ line.
⁶⁶ The large width of this polarization profile, and the fact that the peak does not fall at line center, suggest that the blending C₂ line might affect significantly this signal.
⁶⁷ The signal is somewhat noisy in this spectral region, and it is not possible to exclude that the signal might be classified as ``W''.
⁶⁸ Very likely the overall structure of the polarization signal in the interval between 5204 Å and 5210 Å is due to quantum interferences between the J-levels of the term ⁵P $^{\rm o}$ . Both lines seem to show an ``MS'' structure partially hidden by blends.
⁶⁹ This line is severely blended with a Fe I line. In the absence of this blend the amplitude of the Q/I signal might be larger.
⁷⁰ This signal cannot be classified according to the scheme proposed in this work.
⁷¹ According to our scheme, this polarization signal has to be classified as ``S''. However, it has to be remarked that its width is much larger than the width of any other signal of this class.

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