\begin{table}
\caption{\label{table.xraycounterparts} Optical/near-infrared counterparts of
X-ray sources in Table~\ref{table.xraydetections}.}
\begin{tabular}{l l l l l}
\hline
\hline
            \noalign{\smallskip}
No.	& 2MASS  		& Name			& Alternative name	& Class	\\
	& designation		&			&			&	\\
            \noalign{\smallskip}
\hline
            \noalign{\smallskip}
1	& 05384476--0236001 	& Mayrit AB        	& $\sigma$~Ori~AB + ``F''	& Young star		\\      
2	& 05383848--0234550    	& Mayrit 114305 AB	& [W96] 4771--1147 AB 		& Young star		\\      
3	& 05384719--0235405    	& Mayrit 42062 AB  	& $\sigma$~Ori~E + ``Eb''	& Young star		\\      
4	& 05384027--0230185    	& Mayrit 348349    	& Haro 5--13			& Young star		\\      
5	& 05385337--0233229    	& Mayrit 203039    	& [W96] 4771--1049		& Young star		\\      
6	& 05384424--0232336    	& Mayrit 207358    	& [W96] 4771--1055		& Young star		\\      
7	& 05375303--0233344    	& Mayrit 789281    	& 2E 1454			& Young star		\\ % [LC2008] 23, [W96] 4771--0775      
8	& 05393654--0242171 	& Mayrit 863116 AB 	& RX J0539.6--0242 AB		& Young star		\\ % RX J0539.6-0242 AB, 2E 1484 AB      
9	& 05375630--0245130    	& 2E 1456	   	& 2E 0535.4--0246 		& Galaxy		\\      
10	& 05390149--0238564    	& Mayrit 306125 AB 	& HD 37525 AB			& Young star		\\      
11	& 05384355--0233253    	& Mayrit 156353    	& [SWW2004] 36			& Young star		\\ % [SWW2004] J053843.449-023325.33    
12	& 05383822--0236384 	& Mayrit 105249    	& [W96] rJ053838--0236		& Young star		\\      
13	& 05383284--0235392    	& Mayrit 180277    	& [W96] rJ053832--0235b		& Young star		\\       
14	& 05375440--0239298    	& Mayrit 783254    	& 2E 1455			& Young star		\\   
15	& 05384423--0240197 	& Mayrit 260182    	& [W96] 4771--1051		& Young star		\\      
16	& 05384129--0237225 	& Mayrit 97212     	& [W96] rJ053841--0237		& Young star		\\      
17	& 05384917--0238222    	& Mayrit 157155    	& [W96] rJ053849--0238		& Young star		\\      
18	& 05391163--0236028    	& Mayrit 403090    	& [W96] 4771--1038		& Young star		\\      
19	& 05380784--0231314    	& Mayrit 615296    	& 2E 1459			& Young star		\\ % [LC2008] 37       
20	& 05383587--0230433    	& Mayrit 344337 AB    	& [W96] 4771--1097		& Young star		\\ % 2E 1458     
21	& 05384803--0227141    	& Mayrit 528005 AB 	& [W96] 4771--0899 AB		& Young star		\\      
22	& 05383546--0231516 	& Mayrit 285331    	& [W96] rJ053835--0231		& Young star		\\        
23	& 05384868--0236162    	& Mayrit 61105     	& [SWW2004] 35			& Young star		\\ 
25  &{\em 05384484--0235571}    & Mayrit 3020 AB	& $\sigma$~Ori~IRS1~AB 		& Young star		\\ % DOUBLE detection	 
26	& 05384746--0235252    	& Mayrit 53049     	& [SWW2004] 78			& Young star		\\ % Class II     
27	& 05385317--0243528    	& Mayrit 489165    	& [SWW2004] 47			& Young star		\\      
28	& 05383587--0243512    	& Mayrit 489196    	& TY Ori			& Young star		\\ % Halpha     
29	& 05384791--0237192 	& Mayrit 92149 AB     	& [W96] R053847--0237 AB	& Young star		\\      
30	& 05390760--0232391    	& Mayrit 397060    	& V507 Ori			& Young star		\\ % Halpha      
31	& 05390052--0239390    	& [W96] 4771--1056 	& [SSC2008] 41			& Possible field star	\\ % [W96] 4771--1056, Mayrit 322123 (?), Wolk (1996): K1, Li I = 0.107, Ha = +0.520   
32	& 05390540--0232303    	& Mayrit 374056    	& [W96] 4771--1075		& Young star		\\      
33	& 05391807--0229284    	& Mayrit 634052    	& [W96] 4771--0598		& Young star		\\ % Debris disc     
34	& 05383422--0234160    	& Mayrit 189303    	& HD 294272 B			& Young star		\\      
35	& 05385410--0249297    	& Mayrit 822170    	& RX J0538.9--0249		& Young star		\\	
36	& 05383157--0235148    	& Mayrit 203283    	& [W96] rJ053831--0235		& Young star		\\	
37	& 05385145--0236205    	& Mayrit 102101 AB    	& [W96] rJ053851--0236		& Young star		\\ % Halpha	
38	& 05382911--0236026    	& Mayrit 234269    	& [SWW2004] 177			& Young star		\\	
39	& 05383431--0235000 	& Mayrit 168291 AB	& [W96] rJ053834--0234  	& Young star		\\ % [HHM2007] 592, [GNR2008] 9, [SSC2008] 7
40	& 05385200--0246436    	& Mayrit 653170    	& RU Ori			& Young star		\\	
41	& 05384537--0241594    	& Mayrit 359179    	& V595 Ori			& Young star		\\ % Halpha	
42	& 05382639--0234286    	& SO210038         	& 2MASS J05382639--0234286	& Field star		\\	
43	& 05385003--0237354 	& Mayrit 124140    	& [W96] pJ053850--0237		& Young star candidate	\\	
44	& 05393256--0239440    	& Mayrit 750107    	& [W96] rJ053932--0239		& Young star		\\	
45	& 05382725--0245096    	& Mayrit 609206    	& V505 Ori			& Young star		\\	
46	& 05392456--0220441    	& Mayrit 1093033   	& [HHM2007] 1030		& Young star candidate	\\ % No. 46	
47	& 05384135--0236444	& Mayrit 68229     	& [W96] pJ053841--0236		& Young star		\\	
48	& 05383335--0236176    	& Mayrit 172264    	& [SWW2004] 130			& Young star candidate	\\ % [SWW2004] J053833.280-023617.81, [SSC2008] 5   
49	& 05385173--0236033 	& Mayrit 105092    	& [FPS2006] NX 103		& Young star		\\	
50	& 05390276--0229558 	& Mayrit 453037 AB   	& [W96] R053902--0229 AB	& Young star		\\	
51	& 05385306--0238536 	& [SWW2004] 166    	& [OJV2006] 6			& Field star		\\ % [SWW2004] J053853.040-023853.53, [OJV2006] 6, [SFR2008] S11
52	& 05384828--0236409    	& Mayrit 67128     	& [FPS2006] NX 91		& Young star		\\	
53	& 05391506--0231376    	& Mayrit 524060    	& HD 37564			& Young star		\\	
54	& 05384921--0241251    	& Mayrit 332168 AB    	& [SWW2004] 205			& Young star		\\	
55	& 05385911--0247133    	& Mayrit 707162    	& [W96] rJ053859--0247 AB	& Young star		\\	
57	& 05382774--0243009    	& Mayrit 492211    	& [SWW2004] 87			& Young star		\\ % [SWW2004] J053827.639-024301.36	 
58  &{\em 05384531--0235413}    & Mayrit 21023     	& [BHM2009] 14			& Young star candidate	\\ % SigOri-MAD-14	
59	& 05384227--0237147    	& Mayrit 83207     	& [W96] pJ053842--0237		& Young star		\\ % Class II	
60	& 05383405--0236375    	& Mayrit 165257    	& [W96] rJ053833--0236		& Young star		\\	
61	& 05384301--0236145    	& Mayrit 30241     	& [HHM2007] 687			& Young star candidate	\\ 
63	& 05385955--0245080    	& Mayrit 591158    	& [W96] 4771--0026		& Young star		\\ % SO420039 in GH08, primordial lithium abundance	
64	& 05384123--0237377    	& UCM0536--0239     	& [HHM2007] 668			& Galaxy		\\	
65	& 05384333--0232008    	& Mayrit 240355 AB    	& [SWW2004] 144			& Young star		\\ % Class II	
66	& 05392286--0233330    	& Mayrit 590076    	& [W96] rJ053923--0233		& Young star		\\	
67	& 05384684--0236435    	& Mayrit 53144     	& [BNL2005] 3.01--67		& Young star		\\ % low g
69	& 05382993--0223381 	& [W96] rJ053829--0223	& SO120731			& Field star		\\	  
70	& 05384561--0235588    	& Mayrit 13084     	& $\sigma$~Ori~D		& Young star		\\ 	
71	& 05380826--0235562 	& Mayrit 547270 AB    	& Kiso A--0976 316		& Young star		\\ % Halpha	
72	& 05383368--0244141    	& Mayrit 521199    	& TX Ori			& Young star		\\ % Halpha, Class II, Ca II, Si	
73	& 05390524--0233005    	& Mayrit 355060    	& [SWW2004] 175			& Young star		\\	
74	& 05383479--0234158    	& Mayrit 182305    	& HD 294272 A			& Young star		\\	
75	& 05392519--0238220    	& Mayrit 622103    	& BG Ori			& Young star		\\ 
77	& 05375161--0235257    	& Mayrit 797272    	& [W96] rJ053751--0235		& Young star		\\ % alt. [SWW2004] 125 	
78	& 05385077--0236267    	& Mayrit 94106     	& [KJN2005] 8			& Young star		\\	
79	& 05383141--0236338    	& Mayrit 203260    	& Haro 5--11			& Young star		\\	
80	& 05391151--0231065    	& Mayrit 497054    	& V509 Ori			& Young star		\\	
81	& 05390115--0236388    	& Mayrit 249099    	& [KJN2005] 9			& Young star		\\	
82	& 05381834--0235385    	& Mayrit 396273    	& S~Ori J053818.2--023539	& Young brown dwarf	\\ % low g 
84	& 05390894--0239579    	& Mayrit 433123    	& S~Ori 25			& Young brown dwarf	\\	
85	& 05383972--0240197    	& Mayrit 270196    	& [HHM2007] 655			& Young star candidate	\\	
86	& 05383687--0236432    	& Mayrit 126250 AB    	& [SWW2004] 154	AB		& Young star candidate	\\	
87	& 05382021--0238016 	& Mayrit 387252    	& S~Ori J053820.1--023802	& Young star		\\	
88	& 05394619--0240320 	& Mayrit 960106    	& V1147 Ori			& Young star		\\ % HRC-I border
89	& 05390759--0228234    	& Mayrit 571037    	& [W96] rJ053907--0228		& Young star		\\	
90	& 05391717--0225433    	& Mayrit 785038    	& Kiso A--0904 80		& Young star		\\ % Halpha	
92	& 05384970--0234526    	& Mayrit 100048    	& [HHM2007] 754			& Young star		\\ % Class II	
94	& 05380167--0225527 	& Mayrit 887313    	& [SE2004] 53			& Young star candidate	\\	
95	& 05392435--0234013 	& Mayrit 605079    	& [SWW2004] 127			& Young star candidate	\\ % Lithium-depleted, [SWW2004] J053924.358-023401.25	 
98	& 05393378--0220398 	& Mayrit 1178039   	& [SWW2004] 138			& Young star candidate	\\ % HRC-I border, [SWW2004] J053933.792-022039.74	  
99	& 05393729--0226567    	& Mayrit 957055    	& [SWW2004] 163			& Young star candidate	\\ % 2E 1483?, [SWW2004] J053937.293-022656.70	
103	& 05391699--0241171    	& Mayrit 578123    	& [FPS2006] NX 153		& Young star candidate	\\	
\end{tabular}
\end{table}