\begin{table}%ta1
\caption{\label{taba1}X-ray sources detected in CMa R1 by {\it ROSAT}.} 
%\centerline

\begin{tabular}{cccccccccccccc}
\hline\hline
CMaX &	Err&Cnt/ks	&			$S/N$ &		log$L_{\rm x}$ &	RA  	&	Dec  	&	$R$	&	$A_V$	&	$J$	  &	$H$	     &	$K$	       &	Age	&	Mass	\\
         &    ($''$)      &         &               &             & J2000  &  J2000    & (mag) &  (mag)  &   (mag) &   (mag) &  (mag)   &  (Myr)    &   ($M_{\odot}$)  \\
\hline
\noalign{\smallskip}
1	&	30	&	16.7	$\pm$	1.6	&	10.4	&	31.25	&	6 57 52.6	&	$-11$ 27 23	&	9.7	&	1.0	&	8.9	&	8.7	&	8.6	&	$<$1	&	3.0--5.0	 \\
2	&	30	&	5.0	$\pm$	0.8	&	6.3	&	30.72	&	6 58 17.6	&	$-11$ 37 10	&	15.7	&	1.0	&	14.5	&	13.9	&	13.8	&	05--10	&	1.0--1.5	 \\
3$^a$	&	30	&	17.9	$\pm$	1.6	&	11.2	&	31.28	&	6 58 42.6	&	$-11$ 42 00	&	9.0	&	0.5	&	8.4	&	8.2	&	8.1	&	$<$1	&	3.0--5.0	 \\
4$^b$	&	30	&	19.4	$\pm$	1.4	&	13.9	&	31.31	&	6 59 02.0	&	$-11$ 00 38	&	10.8	&	0.4	&	11.5	&	11.4	&	11.4	&	05--10	&	1.5--2.0	 \\
5$^c$	&	30	&	5.0	$\pm$	0.9	&	5.6	&	30.72	&	6 59 10.7	&	$-11$ 40 03	&	8.3	&	0.5	&	7.7	&	7.5	&	7.4	&	$<$1? 	&	$>$5	 \\
6	&	30	&	7.0	$\pm$	0.9	&	7.8	&	30.87	&	6 59 10.7	&	$-11$ 57 30	&	13.0	&	1.0	&	11.2	&	10.8	&	10.7	&	02--05	&	2.0--3.0	 \\
7	&	30	&	5.1	$\pm$	0.8	&	6.4	&	30.73	&	6 59 31.0	&	$-11$ 58 18	&	11.8	&	0.9	&	11.0	&	10.6	&	10.6	&	02--05	&	2.0--3.0	 \\
8	&	20	&	2.4	$\pm$	0.6	&	4.0	&	30.40	&	6 59 51.1	&	$-11$ 15 52	&	12.7	&	0.5	&	11.2	&	10.7	&	10.5	&	01--02	&	2.0--3.0	 \\
9	&	12	&	1.4	$\pm$	0.4	&	3.5	&	30.17	&	(7 00 00.5)	&	($-11$ 14 09)	&	--	& 	--	&	--	&	--	&	--	&	--	&	--	 \\
10	&	30	&	5.1	$\pm$	0.7	&	7.3	&	30.73	&	7 00 03.4	&	$-11$ 47 45	&	--	&	--	&	9.6	&	9.6	&	9.6	&	$<$ 1	&	3.0--5.0	 \\
11	&	10	&	2.8	$\pm$	0.5	&	5.6	&	30.47	&	7 00 03.8	&	$-11$ 15 26	&	14.8	&	0.4	&	13.7	&	13.2	&	13.0	&	20--50	&	1.0--1.5	 \\
12	&	5	&	3.7	$\pm$	0.6	&	6.2	&	30.59	&	7 00 05.2	&	$-11$ 31 46	&	14.8	&	0.8	&	13.4	&	12.8	&	12.7	&	05--10	&	1.0--1.5	 \\
13	&	12	&	1.2	$\pm$	0.3	&	4.0	&	30.10	&	7 00 08.0	&	$-11$ 37 00	&	14.9	&	0.5	&	14.1	&	13.4	&	13.2	&	05--10	&	1.0--1.5	 \\
14	&	12	&	2.2	$\pm$	0.4	&	5.5	&	30.36	&	7 00 12.5	&	$-11$ 34 33	&	16.6	&	0.8	&	13.8	&	13.1	&	12.9	&	02--05	&	1.0--1.5	 \\
15	&	10	&	1.9	$\pm$	0.4	&	4.8	&	30.30	&	(7 00 14.5)	&	($-11$ 18 51)	&	--	&	--	&	--	&	--	&	--	&	--	&	--	 \\
16	&	10	&	2.0	$\pm$	0.5	&	4.0	&	30.32	&	7 00 17.0	&	$-11$ 08 03	&	13.7	&	0.4	&	12.6	&	12.4	&	12.3	&	$>$50 	&	1.5--2.0	 \\
17	&	9	&	1.3	$\pm$	0.3	&	4.3	&	30.14	&	(7 00 19.8)	&	($-11$ 23 20)	&	--	&	--	&	 - -	&	--	&	--	&	--	&	--	 \\
18	&	8	&	1.1	$\pm$	0.3	&	3.7	&	30.06	&	7 00 26.5	&	$-11$ 26 33	&	14.9	&	0.8	&	13.1	&	12.4	&	12.2	&	02--05	&	1.0--1.5	 \\
19	&	30	&	4.6	$\pm$	0.8	&	5.8	&	30.69	&	7 00 27.1	&	$-11$ 51 26	&	13.4	&	0.8	&	12.4	&	12.1	&	12.0	&	10--20	&	1.5--2.0	 \\
20$^d$	&	5	&	62.7	$\pm$	1.9	&	33.0	&	31.82	&	7 00 37.6	&	$-11$ 14 45	&	7.8	&	0.7	&	6.6	&	6.0	&	5.9	&	$<$1?	&	$>$5	 \\
21	&	30	&	41.6	$\pm$	1.9	&	21.9	&	31.64	&	7 00 40.4	&	$-11$ 04 35	&	12.3	&	0.9	&	10.6	&	9.9	&	9.7	&	$<$1	&	1.0--1.5	 \\
22	&	6	&	2.0	$\pm$	0.4	&	5.0	&	30.32	&	(7 00 41.3)	&	($-11$ 34 50)	&	--	&	--	&	--	&	--	&	--	&	--	&	--	 \\
23	&	5	&	3.4	$\pm$	0.5	&	6.8	&	30.55	&	7 00 43.4	&	$-11$ 17 14	&	14.3	&	0.5	&	12.9	&	12.3	&	12.2	&	02--05	&	1.5--2.0	 \\
24$^*$	&	8	&	1.1	$\pm$	0.4	&	2.8	&	30.06	&	7 00 45.4	&	$-11$ 31 00	&	16.9	&	0.5	&	15.9	&	15.6	&	15.0	&	??	&	??	 \\
25	&	8	&	0.4	$\pm$	0.2	&	2.0	&	29.62	&	7 00 45.5	&	$-11$ 20 29	&	17.0	&	0.8	&	16.0	&	15.7	&	15.6	&	??	&	??	 \\
26	&	12	&	1.2	$\pm$	0.3	&	4.0	&	30.10	&	7 00 54.6	&	$-11$ 34 12	&	14.0	&	0.8	&	13.2	&	12.8	&	12.7	&	20--50	&	1.0--1.5	 \\
27$^*$	&	10	&	2.2	$\pm$	0.5	&	4.4	&	30.36	&	7 00 55.5	&	$-11$ 21 45	&	15.7	&	0.7	&	14.6	&	14.3	&	14.1	&	01--02	&	0.1--0.5	 \\
28	&	8	&	0.9	$\pm$	0.3	&	3.0	&	29.98	&	7 00 55.8	&	$-11$ 26 25	&	15.8	&	0.8	&	13.6	&	12.8	&	12.6	&	??	&	??	 \\
29	&	5	&	2.5	$\pm$	0.4	&	6.3	&	30.42	&	7 01 00.8	&	$-11$ 19 29	&	15.4	&	1.0	&	12.8	&	12.1	&	11.9	&	$<$1	&	0.5--1.0	 \\
30	&	12	&	2.1	$\pm$	0.5	&	4.2	&	30.34	&	7 01 04.1	&	$-11$ 39 48	&	16.4	&	0.7	&	15.2	&	14.4	&	14.2	&	05--10	&	0.1--0.5	 \\
31	&	9	&	0.8	$\pm$	0.3	&	2.7	&	29.93	&	7 01 06.9	&	$-11$ 31 23	&	10.6	&	0.7	&	9.4	&	9.0	&	8.8	&	$<$1	&	3.0--5.0	 \\
32	&	8	&	2.1	$\pm$	0.4	&	5.3	&	30.34	&	7 01 11.2	&	$-11$ 27 50	&	11.4	&	0.9	&	10.8	&	10.6	&	10.5	&	02--05	&	2.0--3.0	 \\
33	&	15	&	0.9	$\pm$	0.3	&	3.0	&	29.98	&	7 01 13.1	&	$-11$ 21 01	&	16.4	&	1.0	&	14.9	&	14.4	&	14.3	&	??	&	??	 \\
34	&	8	&	1.3	$\pm$	0.3	&	4.3	&	30.14	&	7 01 16.3	&	$-11$ 25 58	&	15.2	&	1.0	&	13.7	&	13.0	&	12.9	&	05--10	&	1.0--1.5	 \\
35	&	8	&	0.7	$\pm$	0.3	&	2.3	&	29.87	&	7 01 20.1	&	$-11$ 17 44	&	15.6	&	0.7	&	13.3	&	12.9	&	12.8	&	20--50	&	1.0--1.5	 \\
36	&	15	&	1.1	$\pm$	0.3	&	3.7	&	30.06	&	7 01 24.4	&	$-11$ 09 06	&	16.2	&	0.5	&	14.8	&	14.2	&	14.1	&	20--50	&	0.5--1.0	 \\
37	&	15	&	2.1	$\pm$	0.4	&	5.3	&	30.34	&	(7 01 25.0)	&	($-11$ 08 50)	&	--	&	--	&	--	&	--	&	--	&	--	&	--	 \\
38	&	5	&	3.5	$\pm$	0.4	&	8.8	&	30.57	&	7 01 26.8	&	$-11$ 28 21	&	13.5	&	0.8	&	12.3	&	12.0	&	11.9	&	10--20	&	1.5--2.0	 \\
39	&	8	&	0.8	$\pm$	0.3	&	2.7	&	29.93	&	7 01 29.2	&	$-11$ 21 30	&	15.4	&	0.8	&	14.1	&	13.5	&	13.5	&	10--20	&	1.0--1.5	 \\
40	&	10	&	2.0	$\pm$	0.4	&	5.0	&	30.32	&	7 01 30.4	&	$-11$ 22 29	&	16.9	&	1.2	&	15.4	&	14.8	&	14.8	&	??	&	??	 \\
41	&	8	&	1.6	$\pm$	0.4	&	4.0	&	30.23	&	7 01 34.0	&	$-11$ 25 33	&	15.3	&	0.8	&	13.8	&	13.2	&	13.1	&	10--20	&	1.0--1.5	 \\
42	&	10	&	1.8	$\pm$	0.4	&	4.5	&	30.28	&	(7 01 34.3)	&	($-11$ 11 16)	&	--	&	--	&	--	&		--&	--	&	--	&	--	 \\
43	&	15	&	0.6	$\pm$	0.3	&	2.0	&	29.80	&	07 01 35.1	&	$-11$ 36 38	&	14.3	&	1.3	&	12.1	&	11.8	&	11.7	&	10--20	&	1.5--2.0	 \\
44	&	8	&	1.2	$\pm$	0.3	&	4.0	&	30.10	&	7 01 35.8	&	$-11$ 17 36	&	13.6	&	0.8	&	12.8	&	12.5	&	12.4	&	10--20	&	1.0--1.5	 \\
45	&	10	&	1.2	$\pm$	0.4	&	3.0	&	30.10	&	7 01 41.1	&	$-11$ 32 57	&	12.9	&	1.0	&	12.2	&	11.9	&	11.9	&	10--20	&	1.5--2.0	 \\
46	&	15	&	1.4	$\pm$	0.4	&	3.5	&	30.17	&	(7 01 43.0)	&	($-11$ 10 20)	&	--	&	--	&	--	&	--	&	--	&	--	&	--	 \\
47	&	8	&	2.1	$\pm$	0.4	&	5.3	&	30.34	&	7 01 45.9	&	$-11$ 30 33	&	15.4	&	0.7	&	13.4	&	12.7	&	12.5	&	01--02	&	0.5--1.0	 \\
48$^e$	&	15	&	2.7	$\pm$	0.4	&	6.8	&	30.45	&	7 01 49.3	&	$-11$ 18 07	&	7.5	&	1.7	&	6.3	&	6.2	&	6.0	&	??	&	??	 \\
49	&	9	&	1.5	$\pm$	0.4	&	3.8	&	30.20	&	7 01 49.5	&	$-11$ 16 41	&	12.2	&	1.7	&	10.8	&	10.3	&	10.2	&	02--05	&	2.0--3.0	 \\
50	&	12	&	1.1	$\pm$	0.3	&	3.7	&	30.06	&	7 01 52.4	&	$-11$ 20 18	&	13.4	&	1.3	&	12.1	&	11.7	&	11.5	&	05--10	&	1.5--2.0	 \\
51	&	8	&	1.3	$\pm$	0.4	&	3.3	&	30.14	&	7 01 56.3	&	$-11$ 24 07	&	16.5	&	1.2	&	14.3	&	13.6	&	13.4	&	10--20	&	1.0--1.5	 \\
52	&	8	&	2.3	$\pm$	0.4	&	5.8	&	30.38	&	7 01 58.7	&	$-11$ 15 45	&	13.5	&	1.7	&	12.3	&	11.6	&	11.5	&	01--02	&	2.0--3.0	 \\
53	&	14	&	1.5	$\pm$	0.4	&	3.8	&	30.20	&	7 02 04.4	&	$-11$ 19 44	&	14.1	&	1.2	&	13.4	&	13.0	&	12.9	&	$>$50	&	05--1.0	 \\
54	&	15	&	0.5	$\pm$	0.3	&	1.7	&	29.72	&	(7 02 05.5)	&	($-11$ 26 50)	&	--	&	--	&	--	&	--	&	--	&	--	&	--	 \\
55	&	30	&	0.6	$\pm$	0.3	&	2.0	&	29.80	&	(7 02 07.4)	&	($-11$ 17 11)	&	--	&	--	&	--	&	--	&	--	&	--	&	--	 \\
56	&	30	&	5.3	$\pm$	0.8	&	6.6	&	30.75	&	7 02 38.9	&	$-11$ 30 39	&	12.8	&	0.9	&	9.9	&	8.9	&	8.6	&	??	&	??	 \\
57$^f$	&	30	&	2.3	$\pm$	1.0	&	2.3	&	30.40	&	7 02 42.6	&	$-11$ 27 12	&	8.0	&	1.6	&	7.8	&	7.8	&	7.7	&	$<$1?	&	$>$5	 \\
58	&	30	&	2.0	$\pm$	1.0	&	2.0	&	30.32	&	7 02 47.3	&	$-11$ 28 08	&	16.6	&	1.6	&	14.9	&	14.3	&	14.1	&	$>$50	&	1.0--1.5	 \\
59	&	30	&	1.9	$\pm$	1.0	&	2.0	&	30.31	&	7 02 51.3	&	$-11$ 24 03	&	17.5	&	4.0	&	14.6	&	13.7	&	13.4	&	05--10	&	1.0--1.5	 \\
\hline
\end{tabular}
\smallskip
\par
Columns description: (1) Source name: CMaX~1 to 56 (Field~1), CMaX~62 to 98 (Field~2), CMaX~57 to 61 (both fields); (2--5) X-ray data; (6,~7)~Coordinates of the optical counterpart, when available; (8, 9) $R$ magnitude and visual extinction ($A_V$), obtained from 
 available catalogues; (10--12)~Near-IR magnitudes from the 2MASS catalogue; (13, 14) The estimation of age and mass is based on near-IR. 
\par
Notes: Stars previously identified (Clari\'a  1974, indicated by ``C and Shevchenko et~al. \cite{Shevchenko1999}, indicated by ``SEI''): (a) HD~51896 (F5), (b) SS~75, (c)~HD~52014 (F5), (d) HD~52385 (K0),	(e) GU~CMa, HD~52721 (B2V), C~63 ,  SEI~158; (f) FZ ~CMa (B2.5), C~67, SEI~159;	(g)	Z~CMa (Bpe), C~76, SEI~161; (h) BD~-111762 (B2), C~77, SEI~92; (i) C~14, SEI~94.	
Members of clusters: (j)  vdB-RN92, (k) BRC~27. Objects detected by {\it XMM-Newton} and/or {\it Chandra} are indicated by ``x''. Relevant sources: (*) $H-K$ excess.
\end{table}