Table 4: Objects properties.
Name $F_{0.1-2.4~{\rm keV}}$ $F_{20~{\rm cm}}$ $V_{\rm mag}$ z ^(a) $\alpha_{\rm oiii}^{\rm oii}$ ^(b) Ca H&K break ^(c) S/N EW ^(e)

[ ${\rm erg/cm^{2}/s}$ ] [mJy]

(1) (2) (3) (4) (5) (6) (7) (8) (9)

SHBL J001527.9+353639 3.45E-12 11.2 18.2 / / / 13 <5.9

SHBL J003334.2-192133 ^(d) 1.49E-11 18.9 16.1 0.610? 1.04 0 40 <2.6

SHBL J004208.0+364112 ^(d) 3.68E-12 12 17.9 / / / 15 <5.2

SHBL J011501.9-340027 2.20E-12 6.4 20.1 0.482 1.87 $0.14 \pm 0.08$ 15 <3.1

SHBL J011747.0-244333 3.82E-12 10.3 19 0.279 4.03 $0.30 \pm 0.05$ 30 <2.7

SHBL J012657.2+330730 4.75E-12 7.1 17.5 / / / 12 <6.5

SHBL J013632.5+390559 ^(d) 2.33E-11 60.6 15.4 / / / 12 <6.4

SHBL J020412.8-333342 2.54E-12 6.4 18.6 0.617 1.65 $0.04 \pm 0.05$ 27 <2.9

SHBL J031633.7-221611 2.44E-12 4.4 19 0.228 4.63 $0.38 \pm 0.08$ 27 <2.9

SHBL J032350.7+071737 6.69E-12 4.5 20.3 / / / 10 <7.4

SHBL J040324.5-242950 5.01e-12 7.4 20.1 0.357 2.67 $0.09 \pm 0.12$ 25 <3.5

SHBL J041112.2-394143 4.10E-12 5.3 18.8 / / / 12 <6.5

SHBL J044127.4+150456 3.93E-11 14 19.8 0.109 4.62 $0.44 \pm 0.28$ 8 <8.4

SHBL J044230.1-001830 4.06E-12 4.2 20 0.449 1.51 $0.08 \pm 0.06$ 17 <4.1

SHBL J050335.3-111507 1.29E-11 10.5 17.9 / / / 9 <8.1

SHBL J050939.8-251403 2.13e-12 4.5 20 0.264 1.95 $0.07 \pm 0.06$ 30 <2.7

SHBL J060714.3-251859 4.13E-12 12.2 18.9 0.275 2.70 $0.13 \pm 0.04$ 28 <2.9

SHBL J062149.6-341149 4.47E-12 8.8 18.7 0.529 0.86 $0.02 \pm 0.04$ 31 <2.5

SHBL J075124.9+173051 3.85E-12 10.5 17.4 0.185 ? ? 21 <3.6

SHBL J075324.6+292132 2.78E-12 4.3 18.7 0.161 5.71 $0.44 \pm 0.14$ 21 <3.5

SHBL J092401.1+053345 ^(d) 5.15E-12 7.6 18.4 / / / 12 <6.5

SHBL J094355.5-070951 2.88E-12 7.3 19.9 0.433 2.90 $0.19 \pm 0.06$ 22 <3.1

SHBL J095224.0+750213 4.83E-12 12.4 17.2 0.179 ? ? 21 <3.5

SHBL J095805.9-031740 2.82E-12 7.6 19.6 / / / 10 <7.6

SHBL J101015.9-311908 2.83E-11 74.4 17.3 0.143 1.61 0 41 <1.8

SHBL J102243.8-011302 ^(d) 1.31E-11 36.3 17.2 / / / 15 <5.0

SHBL J104651.4-253545 4.53E-12 14.3 19.2 0.254 2.27 $0.08 \pm 0.05$ 35 <2.3

SHBL J111939.5-304720 3.72E-12 9.6 19.5 0.412 2.11 $0.08 \pm 0.05$ 21 <3.2

SHBL J113444.5-172902 3.64E-12 5.0 19.7 0.571 1.81 $0.02 \pm 0.05$ 30 <2.5

SHBL J113755.4-171042 4.72E-12 5.3 18.9 0.600 0.66 0 27 <2.9

SHBL J114535.1-034001 7.96E-12 19.7 18.4 0.167 3.73 $0.28 \pm 0.12$ 13 <5.5

SHBL J123417.1-385635 6.10E-12 7.0 18.0 0.236 4.34 $0.31 \pm 0.08$ 23 <3.4

SHBL J123511.0-140322 2.63E-12 4.2 19.8 0.407 1.66 $0.04 \pm 0.05$ 20 <3.4

SHBL J124149.3-145558 ^(d) 1.81E-11 17.3 17.3 / / / 18 <4.4

SHBL J125015.5+315559 1.88E-12 5.7 19.5 / / / 4 <18.6

SHBL J125341.1-393159 1.96E-11 50.1 18.3 0.179 2.84 $0.16 \pm 0.09$ 22 <3.5

SHBL J140630.1-393509 2.56E-12 6.3 20.6 / / / 20 <3.9

SHBL J140630.2+123620 4.04E-12 8.8 19.8 / / / 26 <3.1

SHBL J140659.2+164207 ^(d) 5.43E-12 8.4 18 / / / 16 <4.9

SHBL J142739.5-252102 4.70E-12 3.7 18.9 0.318 5.12 $0.46 \pm 0.13$ 32 <2.7

SHBL J143917.4+393243 ^(d) 1.79E-11 42.9 16.6 0.344 1.03 0 29 <2.3

SHBL J144506.3-032612 ^(d) 7.80E-12 21.8 17.4 / / / 17 <4.5

SHBL J150340.6-154113 ^(d) 2.39E-11 5.9 17.5 / / / 14 <5.6

SHBL J150637.0-054004 5.03E-12 15.3 19.5 0.518 1.88 $0.05 \pm 0.06$ 28 <2.6

SHBL J151041.0+333504 4.45E-12 9.1 17.0 0.112 ? ? 18 <3.9

SHBL J151618.6-152343 ^(d) 1.46E-11 8.6 18.7 / / / 20 <4.0

SHBL J153311.3+185428 ^(d) 1.43E-11 23.0 17.7 0.305 1.41 $0.015 \pm 0.040$ 22 <2.8

SHBL J161204.6-043815 4.40E-12 4.3 18.9 / / / 11 <6.8

SHBL J161632.9+375602 1.47E-12 4.6 18.7 0.204 4.18 $0.27 \pm 0.10$ 16 <4.8

SHBL J163658.4-124837 8.74E-12 26.3 20.1 0.246 3.54 $0.20 \pm 0.03$ 36 <2.2

SHBL J174702.3+493801 2.81E-12 7.9 19.9 0.460 2.26 $0.13 \pm 0.07$ 20 <3.6

SHBL J175615.9+552217 ^(d) 1.48E-11 16.9 17.6 / / / 12 <6.4

SHBL J184822.3+653657 4.29E-12 9.7 18.3 0.364 2.86 $0.11 \pm 0.09$ 18 <3.7

SHBL J203844.8-263633 4.73E-12 5.7 18.5 0.437 2.49 $0.15 \pm 0.07$ 21 <3.3

SHBL J204735.8-290859 3.97E-12 10.7 19.3 0.333 2.28 $0.09 \pm 0.02$ 33 <2.6

SHBL J204921.7+003926 4.85E-12 6.0 18.1 0.256 3.25 $0.21 \pm 0.14$ 18 <4.4

SHBL J205242.7+081038 4.90E-12 6.2 19.6 / / / 12 <6.3

SHBL J213135.4-091523 ^(d) 1.58E-11 43.6 16.6 0.449? 0.91 0 26 <2.7

SHBL J213151.3-251558 6.04E-12 11.0 17.3 / / / 18 <4.2

SHBL J213852.5-205348 ^(d) 1.33E-11 11.5 17.9 0.290 1.22 0 21 <3.9

SHBL J222253.8-175321 2.88E-12 5.7 19.4 0.297 2.10 $0.06 \pm 0.05$ 25 <3.3

SHBL J224910.7-130002 ^(d) 9.73E-12 7.5 18.9 / / / 13 <5.9

SHBL J225147.3-320614 ^(d) 3.61E-12 3.6 19.0 / / / 19 <4.0

SHBL J230436.8+370507 ^(d) 1.85E-11 23.1 17.8 / / / 11 <7.2

SHBL J230722.0-120518 2.94E-12 7.3 18.5 / / / 14 <5.4

SHBL J231028.0-371909 1.97E-12 6.3 17.8 / / / 21 <3.8

SHBL J234333.8+344004 1.51E-11 35 20.1 0.366 2.19 $0.06 \pm 0.05$ 31 <2.2

SHBL J235023.2-243603 2.14E-12 6.7 16.5 0.193 5.02 $0.40 \pm 0.19$ 24 <3.1

^(a) Uncertain redshifts are marked with a "?''. ^(b) Impossible measure of $\alpha_{\rm oiii}^{\rm oii}$ (the $[{\rm O~II}] \lambda3727$ is located in noise) is marked with a "?''. ^(c) We consider the Ca H&K break to have reached its minimum value of zero when the flux blue-ward of this feature is equal to or larger than the one red-ward. The Ca H&K break located in noise are marked with a "?''. ^(d) Sources already classified in literature as BL Lacs (see Paper II). ^(e) 2 $\sigma$ upper limit of observed EW, see text for details.

**Table 4:** Objects properties.
Name	$F_{0.1-2.4~{\rm keV}}$	$F_{20~{\rm cm}}$	$V_{\rm mag}$	z ^(a)	$\alpha_{\rm oiii}^{\rm oii}$ ^(b)	Ca H&K break ^(c)	S/N	EW ^(e)
	[ ${\rm erg/cm^{2}/s}$ ]	[mJy]
(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)
SHBL J001527.9+353639	3.45E-12	11.2	18.2	/	/	/	13	<5.9
SHBL J003334.2-192133 ^(d)	1.49E-11	18.9	16.1	0.610?	1.04	0	40	<2.6
SHBL J004208.0+364112 ^(d)	3.68E-12	12	17.9	/	/	/	15	<5.2
SHBL J011501.9-340027	2.20E-12	6.4	20.1	0.482	1.87	$0.14 \pm 0.08$	15	<3.1
SHBL J011747.0-244333	3.82E-12	10.3	19	0.279	4.03	$0.30 \pm 0.05$	30	<2.7
SHBL J012657.2+330730	4.75E-12	7.1	17.5	/	/	/	12	<6.5
SHBL J013632.5+390559 ^(d)	2.33E-11	60.6	15.4	/	/	/	12	<6.4
SHBL J020412.8-333342	2.54E-12	6.4	18.6	0.617	1.65	$0.04 \pm 0.05$	27	<2.9
SHBL J031633.7-221611	2.44E-12	4.4	19	0.228	4.63	$0.38 \pm 0.08$	27	<2.9
SHBL J032350.7+071737	6.69E-12	4.5	20.3	/	/	/	10	<7.4
SHBL J040324.5-242950	5.01e-12	7.4	20.1	0.357	2.67	$0.09 \pm 0.12$	25	<3.5
SHBL J041112.2-394143	4.10E-12	5.3	18.8	/	/	/	12	<6.5
SHBL J044127.4+150456	3.93E-11	14	19.8	0.109	4.62	$0.44 \pm 0.28$	8	<8.4
SHBL J044230.1-001830	4.06E-12	4.2	20	0.449	1.51	$0.08 \pm 0.06$	17	<4.1
SHBL J050335.3-111507	1.29E-11	10.5	17.9	/	/	/	9	<8.1
SHBL J050939.8-251403	2.13e-12	4.5	20	0.264	1.95	$0.07 \pm 0.06$	30	<2.7
SHBL J060714.3-251859	4.13E-12	12.2	18.9	0.275	2.70	$0.13 \pm 0.04$	28	<2.9
SHBL J062149.6-341149	4.47E-12	8.8	18.7	0.529	0.86	$0.02 \pm 0.04$	31	<2.5
SHBL J075124.9+173051	3.85E-12	10.5	17.4	0.185	?	?	21	<3.6
SHBL J075324.6+292132	2.78E-12	4.3	18.7	0.161	5.71	$0.44 \pm 0.14$	21	<3.5
SHBL J092401.1+053345 ^(d)	5.15E-12	7.6	18.4	/	/	/	12	<6.5
SHBL J094355.5-070951	2.88E-12	7.3	19.9	0.433	2.90	$0.19 \pm 0.06$	22	<3.1
SHBL J095224.0+750213	4.83E-12	12.4	17.2	0.179	?	?	21	<3.5
SHBL J095805.9-031740	2.82E-12	7.6	19.6	/	/	/	10	<7.6
SHBL J101015.9-311908	2.83E-11	74.4	17.3	0.143	1.61	0	41	<1.8
SHBL J102243.8-011302 ^(d)	1.31E-11	36.3	17.2	/	/	/	15	<5.0
SHBL J104651.4-253545	4.53E-12	14.3	19.2	0.254	2.27	$0.08 \pm 0.05$	35	<2.3
SHBL J111939.5-304720	3.72E-12	9.6	19.5	0.412	2.11	$0.08 \pm 0.05$	21	<3.2
SHBL J113444.5-172902	3.64E-12	5.0	19.7	0.571	1.81	$0.02 \pm 0.05$	30	<2.5
SHBL J113755.4-171042	4.72E-12	5.3	18.9	0.600	0.66	0	27	<2.9
SHBL J114535.1-034001	7.96E-12	19.7	18.4	0.167	3.73	$0.28 \pm 0.12$	13	<5.5
SHBL J123417.1-385635	6.10E-12	7.0	18.0	0.236	4.34	$0.31 \pm 0.08$	23	<3.4
SHBL J123511.0-140322	2.63E-12	4.2	19.8	0.407	1.66	$0.04 \pm 0.05$	20	<3.4
SHBL J124149.3-145558 ^(d)	1.81E-11	17.3	17.3	/	/	/	18	<4.4
SHBL J125015.5+315559	1.88E-12	5.7	19.5	/	/	/	4	<18.6
SHBL J125341.1-393159	1.96E-11	50.1	18.3	0.179	2.84	$0.16 \pm 0.09$	22	<3.5
SHBL J140630.1-393509	2.56E-12	6.3	20.6	/	/	/	20	<3.9
SHBL J140630.2+123620	4.04E-12	8.8	19.8	/	/	/	26	<3.1
SHBL J140659.2+164207 ^(d)	5.43E-12	8.4	18	/	/	/	16	<4.9
SHBL J142739.5-252102	4.70E-12	3.7	18.9	0.318	5.12	$0.46 \pm 0.13$	32	<2.7
SHBL J143917.4+393243 ^(d)	1.79E-11	42.9	16.6	0.344	1.03	0	29	<2.3
SHBL J144506.3-032612 ^(d)	7.80E-12	21.8	17.4	/	/	/	17	<4.5
SHBL J150340.6-154113 ^(d)	2.39E-11	5.9	17.5	/	/	/	14	<5.6
SHBL J150637.0-054004	5.03E-12	15.3	19.5	0.518	1.88	$0.05 \pm 0.06$	28	<2.6
SHBL J151041.0+333504	4.45E-12	9.1	17.0	0.112	?	?	18	<3.9
SHBL J151618.6-152343 ^(d)	1.46E-11	8.6	18.7	/	/	/	20	<4.0
SHBL J153311.3+185428 ^(d)	1.43E-11	23.0	17.7	0.305	1.41	$0.015 \pm 0.040$	22	<2.8
SHBL J161204.6-043815	4.40E-12	4.3	18.9	/	/	/	11	<6.8
SHBL J161632.9+375602	1.47E-12	4.6	18.7	0.204	4.18	$0.27 \pm 0.10$	16	<4.8
SHBL J163658.4-124837	8.74E-12	26.3	20.1	0.246	3.54	$0.20 \pm 0.03$	36	<2.2
SHBL J174702.3+493801	2.81E-12	7.9	19.9	0.460	2.26	$0.13 \pm 0.07$	20	<3.6
SHBL J175615.9+552217 ^(d)	1.48E-11	16.9	17.6	/	/	/	12	<6.4
SHBL J184822.3+653657	4.29E-12	9.7	18.3	0.364	2.86	$0.11 \pm 0.09$	18	<3.7
SHBL J203844.8-263633	4.73E-12	5.7	18.5	0.437	2.49	$0.15 \pm 0.07$	21	<3.3
SHBL J204735.8-290859	3.97E-12	10.7	19.3	0.333	2.28	$0.09 \pm 0.02$	33	<2.6
SHBL J204921.7+003926	4.85E-12	6.0	18.1	0.256	3.25	$0.21 \pm 0.14$	18	<4.4
SHBL J205242.7+081038	4.90E-12	6.2	19.6	/	/	/	12	<6.3
SHBL J213135.4-091523 ^(d)	1.58E-11	43.6	16.6	0.449?	0.91	0	26	<2.7
SHBL J213151.3-251558	6.04E-12	11.0	17.3	/	/	/	18	<4.2
SHBL J213852.5-205348 ^(d)	1.33E-11	11.5	17.9	0.290	1.22	0	21	<3.9
SHBL J222253.8-175321	2.88E-12	5.7	19.4	0.297	2.10	$0.06 \pm 0.05$	25	<3.3
SHBL J224910.7-130002 ^(d)	9.73E-12	7.5	18.9	/	/	/	13	<5.9
SHBL J225147.3-320614 ^(d)	3.61E-12	3.6	19.0	/	/	/	19	<4.0
SHBL J230436.8+370507 ^(d)	1.85E-11	23.1	17.8	/	/	/	11	<7.2
SHBL J230722.0-120518	2.94E-12	7.3	18.5	/	/	/	14	<5.4
SHBL J231028.0-371909	1.97E-12	6.3	17.8	/	/	/	21	<3.8
SHBL J234333.8+344004	1.51E-11	35	20.1	0.366	2.19	$0.06 \pm 0.05$	31	<2.2
SHBL J235023.2-243603	2.14E-12	6.7	16.5	0.193	5.02	$0.40 \pm 0.19$	24	<3.1

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