\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}