Table A.1: Fe I and Fe II line list, wavelength, excitation potential, damping constant, and gf-values. For HP1-3, Equivalent widths were measured using both DAOSPEC and line-by-line with IRAF.
Species $\lambda$ ( Å) $\chi_{\rm ex}$ (eV) C₆ log gf HP1-2( EW) HP1-3( EW)

Fe II 6084.12 3.20 3.0E-32 -3.81 24.5 13.1

Fe II 6149.19 3.89 3.0E-32 -2.31 - 27.0

Fe II 6247.59 3.89 3.0E-32 -2.33 - 44.7

Fe II 6432.68 2.89 3.0E-32 -3.61 49.5 34.3

Fe II 6456.38 3.90 3.0E-32 -2.08 69.7 53.8

Fe I 6065.48 2.61 1.5E-32 -1.53 - 137.6

Fe I 6079.01 4.65 1.6E-31 -1.126 - 27.9

Fe I 6082.71 2.22 1.0E-32 -3.572 - 62.7

Fe I 6085.26 2.76 1.4E-32 -3.214 54.7 99.5

Fe I 6093.64 4.61 3.0E-32 -1.449 - 99.5

Fe I 6096.67 3.98 1.8E-31 -1.931 - 40.2

Fe I 6137.00 2.20 8.5E-33 -2.950 113.8 111.2

Fe I 6151.62 2.18 8.1E-33 -3.299 72.3 -

Fe I 6157.73 4.08 7.1E-32 -1.249 59.3 62.1

Fe I 6159.38 4.61 1.3E-31 -1.968 - 12.8

Fe I 6165.36 4.14 7.7E-32 -1.549 - 38.9

Fe I 6170.51 4.80 2.3E-31 -0.430 59.1 -

Fe I 6173.34 2.22 8.4E-33 -2.879 116.2 97.9

Fe I 6180.20 2.73 1.3E-32 -2.784 76.4 77.7

Fe I 6187.99 3.94 1.6E-31 -1.718 47.2 -

Fe I 6200.31 2.61 1.5E-32 -2.437 99.0 -

Fe I 6213.43 2.22 8.4E-33 -2.646 118.0 111.7

Fe I 6215.14 4.19 7.9E-32 -1.438 46.2 51.8

Fe I 6219.28 2.20 8.2E-33 -2.434 124.8 -

Fe I 6220.78 3.88 1.3E-31 -2.462 - 6.3

Fe I 6226.74 3.88 1.3E-31 -2.202 15.8 34.7

Fe I 6229.23 2.85 1.5E-32 -2.973 38.6 58.8

Fe I 6240.65 2.22 1.4E-32 -3.388 72.5 90.1

Fe I 6246.32 3.60 1.2E-31 -0.956 110.0 107.6

Fe I 6256.36 2.45 1.3E-32 -2.624 123.4 -

Fe I 6265.13 2.18 7.9E-33 -2.550 - 131.0

Fe I 6270.23 2.86 1.5E-32 -2.711 - 71.1

Fe I 6271.28 3.33 8.9E-32 -2.957 20.8 35.2

Fe I 6297.79 2.22 8.2E-33 -2.740 103.0 101.6

Fe I 6311.50 2.83 1.4E-32 -3.224 38.6 44.2

Fe I 6315.81 4.08 6.6E-32 -1.712 33.6 43.1

Fe I 6322.69 2.59 1.4E-32 -2.426 96.8 -

Fe I 6330.85 4.73 1.6E-31 -1.737 - 14.5

Fe I 6335.33 2.20 8.0E-33 -2.229 134.8 -

Fe I 6336.82 3.69 1.3E-31 -1.053 113.8 -

Fe I 6344.15 2.43 1.2E-32 -2.922 80.5 94.1

Fe I 6355.03 2.85 1.4E-32 -2.405 95.5 -

Fe I 6362.88 4.19 7.4E-32 -1.974 36.7 -

Fe I 6385.72 4.73 1.5E-31 -1.906 10.4 6.2

Fe I 6392.54 2.28 1.1E-32 -4.028 31.9 -

Fe I 6411.65 3.65 1.2E-31 -0.821 58.7 120.8

Fe I 6419.95 4.73 1.5E-31 -0.250 55.2 67.2

Fe I 6469.19 4.84 1.9E-31 -0.771 27.5 -

Fe I 6475.62 2.56 1.5E-32 -2.941 71.9 -

Fe I 6481.87 2.28 1.1E-32 -2.984 99.1 -

Fe I 6496.47 4.80 1.7E-31 -0.570 - 49.6

Fe I 6518.37 2.83 1.3E-32 -2.748 - 82.7

Fe I 6546.24 2.76 1.2E-32 -1.648 130.3 -

Fe I 6569.22 4.73 1.3E-31 -0.422 61.0 63.9

Fe I 6575.02 2.59 1.4E-32 -2.824 82.1 -

Fe I 6593.87 2.43 1.1E-32 -2.422 123.3 112.4

Fe I 6597.56 4.80 1.2E-32 -1.061 - 26.9

Fe I 6608.03 2.28 1.0E-32 -4.038 - 35.5

Fe I 6609.11 2.56 1.3E-32 -2.692 77.9 83.7

Fe I 6627.54 4.55 9.9E-32 -1.683 - 22.0

Fe I 6633.41 4.84 1.7E-31 -1.490 - 13.5

Fe I 6633.75 4.56 1.4E-31 -0.779 - 49.7

Fe I 6634.11 4.80 1.5E-31 -1.432 - 23.3

Fe I 6639.88 4.08 5.7E-32 -2.462 10.7 -

Fe I 6646.93 2.61 1.4E-32 -3.991 - 18.8

Fe I 6653.85 4.15 1.8E-31 -2.520 - 8.9

Fe I 6663.44 2.42 1.3E-32 -2.478 122.6 -

**Table A.1:** Fe I and Fe II line list, wavelength, excitation potential, damping constant, and gf-values. For HP1-3, Equivalent widths were measured using both DAOSPEC and line-by-line with IRAF.
Species	$\lambda$ ( Å)	$\chi_{\rm ex}$ (eV)	C₆	log gf	HP1-2( EW)	HP1-3( EW)
Fe II	6084.12	3.20	3.0E-32	-3.81	24.5	13.1
Fe II	6149.19	3.89	3.0E-32	-2.31	-	27.0
Fe II	6247.59	3.89	3.0E-32	-2.33	-	44.7
Fe II	6432.68	2.89	3.0E-32	-3.61	49.5	34.3
Fe II	6456.38	3.90	3.0E-32	-2.08	69.7	53.8
Fe I	6065.48	2.61	1.5E-32	-1.53	-	137.6
Fe I	6079.01	4.65	1.6E-31	-1.126	-	27.9
Fe I	6082.71	2.22	1.0E-32	-3.572	-	62.7
Fe I	6085.26	2.76	1.4E-32	-3.214	54.7	99.5
Fe I	6093.64	4.61	3.0E-32	-1.449	-	99.5
Fe I	6096.67	3.98	1.8E-31	-1.931	-	40.2
Fe I	6137.00	2.20	8.5E-33	-2.950	113.8	111.2
Fe I	6151.62	2.18	8.1E-33	-3.299	72.3	-
Fe I	6157.73	4.08	7.1E-32	-1.249	59.3	62.1
Fe I	6159.38	4.61	1.3E-31	-1.968	-	12.8
Fe I	6165.36	4.14	7.7E-32	-1.549	-	38.9
Fe I	6170.51	4.80	2.3E-31	-0.430	59.1	-
Fe I	6173.34	2.22	8.4E-33	-2.879	116.2	97.9
Fe I	6180.20	2.73	1.3E-32	-2.784	76.4	77.7
Fe I	6187.99	3.94	1.6E-31	-1.718	47.2	-
Fe I	6200.31	2.61	1.5E-32	-2.437	99.0	-
Fe I	6213.43	2.22	8.4E-33	-2.646	118.0	111.7
Fe I	6215.14	4.19	7.9E-32	-1.438	46.2	51.8
Fe I	6219.28	2.20	8.2E-33	-2.434	124.8	-
Fe I	6220.78	3.88	1.3E-31	-2.462	-	6.3
Fe I	6226.74	3.88	1.3E-31	-2.202	15.8	34.7
Fe I	6229.23	2.85	1.5E-32	-2.973	38.6	58.8
Fe I	6240.65	2.22	1.4E-32	-3.388	72.5	90.1
Fe I	6246.32	3.60	1.2E-31	-0.956	110.0	107.6
Fe I	6256.36	2.45	1.3E-32	-2.624	123.4	-
Fe I	6265.13	2.18	7.9E-33	-2.550	-	131.0
Fe I	6270.23	2.86	1.5E-32	-2.711	-	71.1
Fe I	6271.28	3.33	8.9E-32	-2.957	20.8	35.2
Fe I	6297.79	2.22	8.2E-33	-2.740	103.0	101.6
Fe I	6311.50	2.83	1.4E-32	-3.224	38.6	44.2
Fe I	6315.81	4.08	6.6E-32	-1.712	33.6	43.1
Fe I	6322.69	2.59	1.4E-32	-2.426	96.8	-
Fe I	6330.85	4.73	1.6E-31	-1.737	-	14.5
Fe I	6335.33	2.20	8.0E-33	-2.229	134.8	-
Fe I	6336.82	3.69	1.3E-31	-1.053	113.8	-
Fe I	6344.15	2.43	1.2E-32	-2.922	80.5	94.1
Fe I	6355.03	2.85	1.4E-32	-2.405	95.5	-
Fe I	6362.88	4.19	7.4E-32	-1.974	36.7	-
Fe I	6385.72	4.73	1.5E-31	-1.906	10.4	6.2
Fe I	6392.54	2.28	1.1E-32	-4.028	31.9	-
Fe I	6411.65	3.65	1.2E-31	-0.821	58.7	120.8
Fe I	6419.95	4.73	1.5E-31	-0.250	55.2	67.2
Fe I	6469.19	4.84	1.9E-31	-0.771	27.5	-
Fe I	6475.62	2.56	1.5E-32	-2.941	71.9	-
Fe I	6481.87	2.28	1.1E-32	-2.984	99.1	-
Fe I	6496.47	4.80	1.7E-31	-0.570	-	49.6
Fe I	6518.37	2.83	1.3E-32	-2.748	-	82.7
Fe I	6546.24	2.76	1.2E-32	-1.648	130.3	-
Fe I	6569.22	4.73	1.3E-31	-0.422	61.0	63.9
Fe I	6575.02	2.59	1.4E-32	-2.824	82.1	-
Fe I	6593.87	2.43	1.1E-32	-2.422	123.3	112.4
Fe I	6597.56	4.80	1.2E-32	-1.061	-	26.9
Fe I	6608.03	2.28	1.0E-32	-4.038	-	35.5
Fe I	6609.11	2.56	1.3E-32	-2.692	77.9	83.7
Fe I	6627.54	4.55	9.9E-32	-1.683	-	22.0
Fe I	6633.41	4.84	1.7E-31	-1.490	-	13.5
Fe I	6633.75	4.56	1.4E-31	-0.779	-	49.7
Fe I	6634.11	4.80	1.5E-31	-1.432	-	23.3
Fe I	6639.88	4.08	5.7E-32	-2.462	10.7	-
Fe I	6646.93	2.61	1.4E-32	-3.991	-	18.8
Fe I	6653.85	4.15	1.8E-31	-2.520	-	8.9
Fe I	6663.44	2.42	1.3E-32	-2.478	122.6	-

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