Table 9: The HRX-BL Lac sample.

Namea	α	δ	zb	fXc	fRd	B mage	K mag	Ca break	Spectrum
1RXS J071030.0+590808	07 10 30.1	+59 08 20	0.125	10.15	159.2	18.4
1RXS J071218.9+571948*	07 12 18.9	+57 19 48	0.095	1.01	7.9	20.1		34%	RXJ 0712.3+5719
0716+714	07 21 53.5	+71 20 36		1.26	727.2	15.5	10.4
MS 0737.9+7441	07 44 05.1	+74 33 58	0.0311	4.46	23.3	16.9	14.6
1RXS J074929.4+745142	07 49 29.7	+74 51 45	0.605	2.80	44.8	18.9	15.2	2%	RXJ 0749.4+7451
1RXS J080323.1+481622*new	08 03 22.9	+48 16 19	0.503	0.92	12.6	18.8		5%	RXJ 0803.3+4816
1RXS J080525.8+753424	08 05 26.9	+75 34 25	0.121	2.59	52.6	18.1	13.7
1RXS J080625.5+593105	08 06 25.9	+59 31 06		2.06	60.9	17.9
1RXS J080938.5+345544	08 09 38.5	+34 55 37	0.082	2.62	223.4	17.0	14.5
1RXS J080949.2+521855	08 09 49.0	+52 18 56	0.138	4.71	182.8	15.6
1RXS J081624.6+573910*new	08 16 22.7	+57 39 09		0.94	100.0	18.8		5%	RXJ 0816.3+5739
1RXS J083251.9+330011	08 32 52.0	+33 00 11	0.671	1.25	6.6	20.7
1RXS J083357.5+472658*new	08 33 57.1	+47 26 51	0.496	0.82	11.6	19.7		14%	RXJ 0833.9+4726
1RXS J085407.7+440840*new	08 54 09.8	+44 08 31		0.76	79.8	18.5	14.3		RXJ 0854.1+4408
1RXS J085451.0+621843*new	08 54 50.5	+62 18 50	0.267?	0.83	387.6	19.0			RXJ 0854.8+6218
1RXS J085916.5+834450	08 59 10.1	+83 45 04	0.327	1.23	10.2	19.71		9%	RXJ 0859.1+8345
1RXS J090315.3+405609*	09 03 14.7	+40 56 01	0.190	0.93	38.2	19.3		25%	RXJ 0903.2+4056
B2 0906+31	09 09 53.3	+31 06 02	0.274	2.18	195.5	18.3	14.1	3%	RXJ 0909.9+3105
1RXS J091324.6+813318	09 13 20.4	+81 33 06	0.639	2.28	4.9	20.71		5%	RXJ 0913.3+8133
B2 0912+29	09 15 52.2	+29 33 20		3.36	342.0	16.31	12.7		RXJ 0915.8+2933a
									RXJ 0915.8+2933b
									RXJ 0915.8+2933c
1RXS J091651.8+523829	09 16 52.0	+52 38 27	0.190	2.02	138.9	18.31	14.3
1RXS J092401.1+053350*new	09 24 01.1	+05 33 50		1.34	7.5	19.61			RXJ 0924.0+0533
1RXS J092804.2+744714	09 28 03.0	+74 47 19	0.638	1.13	85.8	20.81
1ES 0927+500	09 30 37.6	+49 50 24	0.186	13.45	21.4	18.0		26%
1RXS J093056.2+393332*	09 30 56.9	+39 33 37	0.641	0.80	13.0	19.5		30%	RXJ 0930.9+3933
1RXS J094020.7+614837*new	09 40 22.5	+61 48 25	0.212	0.85	12.8	18.4		29%	RXJ 0940.3+6148
1RXS J095214.4+393627*new	09 52 14.0	+39 36 08		0.65	3.0	19.8	15.7		RXJ 0952.2+3936
1RXS J095225.8+750216	09 52 23.8	+75 02 13	0.178	1.98	12.2	19.31	14.6		RXJ 0952.4+7502
1RXS J095410.8+491457*	09 54 09.8	+49 14 59	0.207	0.76	2.7	19.3			n.a.
1RXS J095929.8+212340	09 59 30.0	+21 23 19	0.367	2.32	40.8	19.11	14.6	3%	RXJ 0959.4+2123
1RXS J100656.9+345446*new	10 06 56.3	+34 54 44	0.612?	0.66	6.6	18.7		-14%	RXJ 1006.9+3454
1RXS J100811.5+470526	10 08 11.4	+47 05 20	0.343	4.37	4.7	19.91			RXJ 1008.1+4705
1RXS J101244.4+422959	10 12 44.2	+42 29 57	0.376	3.86	79.5	18.41	14.9	-2%	RXJ 1012.7+4229
GB 1011+496	10 15 04.0	+49 25 59	0.200	6.78	378.1	16.5	13.1
1RXS J101616.4+410817	10 16 16.8	+41 08 12	0.281	2.50	14.8	19.51	14.6
MS 1019.0+5139	10 22 11.3	+51 24 15	0.141	3.35	5.1	18.0
1ES 1028+511	10 31 18.6	+50 53 34	0.361	18.02	37.9	16.8	13.9		RXJ 1031.3+5053a
									RXJ 1031.3+5053b
1RXS J103744.9+571159*	10 37 44.3	+57 11 56		0.60	71.7	16.7			n.a.
1RXS J104148.9+390133*new	10 41 49.0	+39 01 22	0.210	0.71	33.9	18.5	14.4	28 %	RXJ 1041.8+3901
1RXS J105125.1+394329	10 51 25.4	+39 43 26	0.498	1.67	10.8	19.01	15.4	-1%	RXJ 1051.4+3943
1RXS J105607.0+025215*	10 56 06.3	+02 52 28	0.235	6.18	4.3	19.41			n.a.
1RXS J105723.5+230317	10 57 23.0	+23 03 15	0.378	2.14	7.9	19.71		13%	RXJ 1057.3+2303
1RXS J105837.5+562816	10 58 37.8	+56 28 09	0.144	1.36	228.5	15.8			RXJ 1058.6+5628
1RXS J110021.3+401933	11 00 21.0	+40 19 29	0.225?	2.21	18.3	18.61	15.2	-5%	RXJ 1100.3+4019
MRK 421	11 04 27.3	+38 12 32	0.030	116.48	768.5	13.3
1RXS J110748.2+150217*new	11 07 48.2	+15 02 17		2.17	43.5	18.41	14.8		RXJ 1107.8+1502
1RXS J111131.2+345212	11 11 30.9	+34 52 01	0.212	2.73	8.4	19.71
1RXS J111706.3+201410	11 17 06.3	+20 14 08	0.137	24.01	103.1	16.0	12.4	-12%	RXJ 1117.1+2014
1ES 1118+424	11 20 48.1	+42 12 12	0.124	4.63	24.1	18.01	14.7
1RXS J112349.2+723002	11 23 49.2	+72 30 18		1.89	12.5	18.6	13.6		RXJ 1123.8+7230a
									RXJ 1123.8+7230b
MRK 180	11 36 26.6	+70 09 25	0.046	19.73	328.4	14.7	12.4
HS 1133+6753	11 36 30.3	+67 37 05	0.135	11.40	45.8	17.6	13.8
1RXS J114754.9+220548	11 47 54.9	+22 05 34	0.276	1.39	4.1	21.0	15.0	33%	RXJ 1147.9+2205
1RXS J114930.4+243928	11 49 30.3	+24 39 27	0.402	2.56	28.5	19.01		5%	RXJ 1149.5+2439
1RXS J121158.1+224236	12 11 58.7	+22 42 32	0.455	2.61	20.2	19.61		7%	RXJ 1211.9+2242
ON 325 / B2 1215+30	12 17 52.0	+30 07 02	0.130	11.79	572.7	15.6	12.0
PG 1218+304	12 21 21.8	+30 10 37	0.182	9.14	71.5	17.7	13.3
ON 231* / W Comae*	12 21 31.7	+28 13 58	0.102	1.00	732.1	16.5
1RXS J122424.2+243618*	12 24 24.2	+24 36 24	0.218	0.96	25.9	17.7	13.7		n.a.
1RXS J123014.2+251805	12 30 14.0	+25 18 07	0.135	1.34	244.0	16.01	11.7		RXJ 1230.2+2518
MS 1229.2+6430	12 31 31.5	+64 14 16	0.164	1.97	58.8	18.01	13.8
1RXS J123144.7+284754*new	12 31 43.9	+28 47 51	0.236	0.83	141.5	17.5	14.6	-2%	RXJ 1231.7+2847
1RXS J123705.6+302002	12 37 06.0	+30 20 05	0.700	3.23	5.6	20.0			RXJ 1237.0+3020
MS 1235.4+6315	12 37 39.1	+62 58 41	0.297	1.62	12.5	18.91	14.7
1RXS J123923.1+413245	12 39 22.7	+41 32 52	0.16?	1.17	9.1	20.31			RXJ 1239.3+4132
1RXS J124141.2+344032	12 41 41.4	+34 40 31		1.06	10.2	20.21			RXJ 1241.6+3440
1RXS J124312.5+362743	12 43 12.7	+36 27 45		4.66	147.9	16.61	13.4		RXJ 1243.2+3627
1RXS J124818.9+582031	12 48 18.8	+58 20 29		1.73	245.3	14.91	12.0		RXJ 1248.3+5820
1RXS J125301.0+382629	12 53 00.9	+38 26 26	0.372	4.38	4.8	18.91
1ES 1255+244	12 57 31.9	+24 12 40	0.141	4.76	14.7	15.4
1RXS J130255.6+505621	13 02 58.0	+50 56 18	0.688	2.79	2.8	19.31			RXJ 1302.9+5056a
									RXJ 1302.9+5056b
1RXS J132400.2+573918	13 24 00.0	+57 39 16	0.115	1.11	44.2	17.81	13.5
1RXS J132615.0+293332	13 26 15.0	+29 33 30	0.431	1.48	5.6	18.71
1RXS J134029.9+441007	13 40 29.5	+44 10 07	0.548	1.91	57.2	19.31	15.0	-1%	RXJ 1340.4+4410
1RXS J134104.8+395942	13 41 04.9	+39 59 35	0.163	3.83	88.8	18.61	14.3
1RXS J134551.8+425747									erroneous table entry
1RXS J134556.3+365001*	13 45 55.3	+36 50 14	0.255	0.41	144.8	20.3	14.6	34%	RXJ 1345.9+3650
1RXS J135328.2+560102	13 53 28.0	+56 00 55	0.370	1.31	14.9	19.11	15.5
1RXS J140450.2+655433	14 04 49.6	+65 54 30	0.364	1.07	15.4	19.41	15.0		RXJ 1404.8+6554
1RXS J141031.6+610020	14 10 31.7	+61 00 10	0.384	1.37	11.4	19.91	15.4		RXJ 1410.5+6100
1E 1415+259	14 17 56.6	+25 43 25	0.237	10.43	89.6	16.0	13.9
1RXS J141946.4+542324*	14 19 46.6	+54 23 15	0.151	0.64	788.7	15.7	12.4		n.a.
1RXS J142239.1+580159	14 22 39.0	+58 01 55	0.638	10.03	13.2	17.91			RXJ 1422.6+5801a
									RXJ 1422.6+5801b
1RXS J142422.9+343407*new	14 24 22.7	+34 33 57	0.571?	0.80	10.0	18.3			RXJ 1424.3+3433
1RXS J142700.5+234803	14 27 00.5	+23 48 03		2.04	430.1	16.4
1ES 1426+428	14 28 32.6	+42 40 21	0.129	21.75	58.8	16.5	13.6
1RXS J143658.7+563934*new	14 36 57.8	+56 39 25		1.01	21.3	18.8			RXJ 1436.9+5639
1RXS J143917.7+393248	14 39 17.5	+39 32 43		5.12	42.8	16.0	13.7		RXJ 1439.2+3932
MS 1443.5+6349	14 44 34.9	+63 36 06	0.299	1.07	18.9	19.71	15.3
1RXS J144801.0+360833	14 48 01.0	+36 08 33		1.55	36.2	17.2	13.7
1RXS J144932.3+274630	14 49 32.7	+27 46 22	0.228	3.56	90.7	20.01	14.6	15%	RXJ 1449.5+2746
1RXS J145127.5+635421*	14 51 26.0	+63 54 24	0.650	0.90	10.0	19.6			RXJ 1451.4+6354
1RXS J145603.4+504824	14 56 03.7	+50 48 25	0.480	8.60	4.0	18.61
1RXS J145827.3+483250	14 58 28.0	+48 32 40	0.539	2.68	3.1	20.41
1RXS J150101.7+223812	15 01 01.9	+22 38 06	0.235	2.06	32.4	15.51
1RXS J150842.2+270910	15 08 42.7	+27 09 09	0.270	2.99	39.9	18.81		6%	RXJ 1508.7+2709
1RXS J151040.8+333515	15 10 42.0	+33 35 09	0.116	1.74	8.8	18.51	13.8	37%	RXJ 1510.6+3335
1ES 1517+656	15 17 47.5	+65 25 24	0.702	8.03	37.7	16.91	13.6		RXJ 1517.7+6525
1RXS J153202.3+301631	15 32 02.2	+30 16 29	0.064	2.71	54.4	15.5
1RXS J153324.9+341640	15 33 24.3	+34 16 40		1.32	30.0	17.9
1ES 1533+5320	15 35 00.8	+53 20 35	0.890?	8.03	18.2	18.91			RXJ 1535.0+5320a
									RXJ 1535.0+5320b
1RXS J153528.7+392242*	15 35 29.1	+39 22 47	0.257	0.07	19.7	19.8	14.6		n.a.
1ES 1544+820	15 40 15.7	+81 55 06		4.02	69.9	17.11	14.2		RXJ 1540.2+8155
1RXS J155411.8+241415*new	15 54 11.9	+24 14 28	0.301	0.95	12.7	20.41		13%	RXJ 1554.1+2414
MS 1552.1+2020	15 54 24.1	+20 11 25	0.222	2.40	79.4	18.51

^a Objects not included in the complete sample marked with an asterisk, new identifications marked with new.
^b Uncertain redshifts are marked with an "?''.
^c ROSAT PSPC (0.5-2.0 keV) flux in 10^-12 erg cm^-2 s^-1.
^d Radio flux at 1.4 GHz in mJy.
^e B magnitudes determined with the Calar Alto 1.23 m telescope are marked with ¹.