\begin{table}%T3
      \caption{Basic data of our $\sigma$ Orionis cluster members and candidates.} 
         \label{pre}
     \small  
\begin{tabular}{l c c c c c c c c}
            \hline
            \hline
            \noalign{\smallskip}
Name					& $\alpha^{J2000}$ & $\delta^{J2000}$ 	& $I$ (mag)	& $J$ (mag) 	& $\log{\frac{L}{L_\odot}}$ & Mass ($M_\odot$) & Sp.Type      & Remarks$^a$ \\  
            \noalign{\smallskip}
            \hline
            \noalign{\smallskip}
\object{S~Ori J054000.2--025159}      & 05 40 00.15   & $-$02 51 59.4  & 16.19~$\pm$~0.04       & 14.04~$\pm$~0.08& --1.43~$\pm$~0.18       &   $\rm 0.11^{+0.10 }_{-0.05 }$ &		    & Y        \\ % 11142    Ca04
\object{S~Ori J053848.1--024401}      & 05 38 48.19   & $-$02 44 00.8  & 16.15~$\pm$~0.03       & 14.09~$\pm$~0.08& --1.45~$\pm$~0.18       &   $\rm 0.10^{+0.09 }_{-0.05 }$ &		    & Y,D      \\ % 21184    S  
\object{S~Ori J053833.9--024508}      & 05 38 33.88   & $-$02 45 07.8  & 16.15~$\pm$~0.03       & 14.24~$\pm$~0.07& --1.51~$\pm$~0.18       &   $\rm 0.09^{+0.09 }_{-0.04 }$ &		    & Y,D      \\ % 22241    S 
\object{S~Ori J053911.4--023333}      & 05 39 11.40   & $-$02 33 32.8  & 16.35~$\pm$~0.04       & 14.38~$\pm$~0.11& --1.57~$\pm$~0.18       &  $\rm 0.078^{+0.08 }_{-0.03 }$ & M5.0~$\pm$~0.5  & Y        \\ % 33098    S
\object{S~Ori 14}		       & 05 39 37.60   & $-$02 44 30.5  & 16.41~$\pm$~0.04       & 14.40~$\pm$~0.08& --1.58~$\pm$~0.18       &  $\rm 0.076^{+0.08 }_{-0.03 }$ &		    & Y        \\ % 42849    14  
\object{S~Ori 11}		       & 05 39 44.33   & $-$02 33 02.8  & 16.29~$\pm$~0.04       & 14.50~$\pm$~0.12& --1.60~$\pm$~0.18       &  $\rm 0.071^{+0.08 }_{-0.02 }$ & M6.0~$\pm$~0.5  &	       \\ % 32653    11
\object{S~Ori J054014.0--023127}      & 05 40 13.96   & $-$02 31 27.4  & 17.12~$\pm$~0.03       & 14.51~$\pm$~0.10& --1.60~$\pm$~0.18       &  $\rm 0.071^{+0.08 }_{-0.02 }$ &		    & Y        \\ % 32232 C, Ca04  
\object{S~Ori J053847.2--025756}      & 05 38 47.15   & $-$02 57 55.7  & 16.74~$\pm$~0.02       & 14.54~$\pm$~0.08& --1.63~$\pm$~0.18       &  $\rm 0.066^{+0.07 }_{-0.02 }$ &		    & Y,D      \\ % 21798 C, Ca04 
\object{S~Ori J053838.6--024157}      & 05 38 38.59   & $-$02 41 55.9  & 16.38~$\pm$~0.03       & 14.56~$\pm$~0.07& --1.63~$\pm$~0.18       &  $\rm 0.067^{+0.08 }_{-0.02 }$ & M5.5~$\pm$~1.0  & Y        \\ % 22097    S, Ca06
\object{S~Ori 16}		       & 05 39 15.10   & $-$02 40 47.6  & 16.63~$\pm$~0.03       & 14.61~$\pm$~0.10& --1.66~$\pm$~0.18       &  $\rm 0.062^{+0.07 }_{-0.018}$ &		    &	       \\ % 41334 C, 16
\object{S~Ori J053902.1--023501}      & 05 39 01.94   & $-$02 35 02.9  & 16.44~$\pm$~0.03       & 14.69~$\pm$~0.11& --1.67~$\pm$~0.18       &  $\rm 0.061^{+0.07 }_{-0.017}$ &		    & D        \\ % 33564    Ca04
\object{S~Ori 25}		       & 05 39 08.95   & $-$02 39 58.0  & 16.95~$\pm$~0.03       & 14.70~$\pm$~0.10& --1.70~$\pm$~0.18       &  $\rm 0.058^{+0.07 }_{-0.016}$ & M6.5~$\pm$~0.5  & Y        \\ % 41080 C, 25 
\object{S~Ori J053954.3--023719}      & 05 39 54.33   & $-$02 37 18.9  & 16.79~$\pm$~0.03       & 14.77~$\pm$~0.07& --1.72~$\pm$~0.18       &  $\rm 0.056^{+0.06 }_{-0.015}$ & M6.0~$\pm$~1.0  & (D)      \\ % 34451 C, C04 
\object{S~Ori J053844.4--024037}      & 05 38 44.48   & $-$02 40 37.6  & 17.17~$\pm$~0.03       & 14.78~$\pm$~0.08& --1.72~$\pm$~0.18       &  $\rm 0.056^{+0.06 }_{-0.015}$ &		    & D        \\ % 21046    S, T 
\object{S~Ori J053826.1--024041}      & 05 38 26.23   & $-$02 40 41.4  & 16.95~$\pm$~0.02       & 14.81~$\pm$~0.07& --1.74~$\pm$~0.18       &  $\rm 0.054^{+0.06 }_{-0.014}$ & M5.0~$\pm$~2.0  & Y        \\ % 23044 C, S 
\object{S~Ori 20}		       & 05 39 07.58   & $-$02 29 05.6  & 16.80~$\pm$~0.03       & 14.83~$\pm$~0.10& --1.75~$\pm$~0.18       &  $\rm 0.054^{+0.06 }_{-0.014}$ & M5.5~$\pm$~0.5  &	       \\ % 31269 C, 20 
\object{S~Ori J053829.0--024847}      & 05 38 28.97   & $-$02 48 47.3  & 16.81~$\pm$~0.02       & 14.84~$\pm$~0.09& --1.75~$\pm$~0.18       &  $\rm 0.053^{+0.06 }_{-0.014}$ & M6.0~$\pm$~0.5  & D        \\ % 23448 C, S 
\object{S~Ori 27}		       & 05 38 17.42   & $-$02 40 24.3  & 17.05~$\pm$~0.03       & 14.92~$\pm$~0.08& --1.79~$\pm$~0.18       &  $\rm 0.050^{+0.06 }_{-0.013}$ & M6.5~$\pm$~0.5  & Y        \\ % 24047 C, 27 
\object{S~Ori J053825.4--024241}      & 05 38 25.44   & $-$02 42 41.3  & 16.87~$\pm$~0.02       & 14.95~$\pm$~0.07& --1.79~$\pm$~0.18       &  $\rm 0.050^{+0.06 }_{-0.012}$ & M6.0~$\pm$~1.0  & Y,D      \\ % 23156 C, nIR 
\object{S~Ori 28}		       & 05 39 23.19   & $-$02 46 55.8  & 17.14~$\pm$~0.03       & 15.12~$\pm$~0.16& --1.86~$\pm$~0.18       &  $\rm 0.046^{+0.05 }_{-0.012}$ &		    & Y        \\ % 43752 C, 28 
\object{S~Ori 31}		       & 05 38 20.88   & $-$02 46 13.3  & 17.23~$\pm$~0.02       & 15.18~$\pm$~0.09& --1.89~$\pm$~0.18       &  $\rm 0.044^{+0.04 }_{-0.011}$ & M7.0~$\pm$~0.5  &	       \\ % 23341 C, 31 
\object{S~Ori J053922.2--024552}      & 05 39 22.25   & $-$02 45 52.4  & 17.04~$\pm$~0.03       & 15.20~$\pm$~0.15& --1.89~$\pm$~0.18       &  $\rm 0.044^{+0.04 }_{-0.011}$ &		    &	       \\ % 43396 C, C04, GG06
\object{S~Ori 30}		       & 05 39 13.08   & $-$02 37 50.9  & 17.29~$\pm$~0.03       & 15.20~$\pm$~0.07& --1.90~$\pm$~0.18       &  $\rm 0.044^{+0.04 }_{-0.011}$ & M6.0~$\pm$~0.5  & D        \\ % 34576 C, 30 
\object{S~Ori 32}		       & 05 39 43.59   & $-$02 47 31.8  & 17.33~$\pm$~0.03       & 15.34~$\pm$~0.05& --1.95~$\pm$~0.18       &  $\rm 0.041^{+0.04 }_{-0.011}$ &		    & Y        \\ % 44072 C, 32 
\object{S~Ori J053855.4--024121}      & 05 38 55.42   & $-$02 41 20.8  & 18.59~$\pm$~0.04       & 15.38~$\pm$~0.10& --1.88~$\pm$~0.18       &  $\rm 0.045^{+0.05 }_{-0.011}$ &		    & D,New    \\ % 41521 -- ?L?
\object{S~Ori J054004.5--023642}      & 05 40 04.54   & $-$02 36 42.1  & 17.50~$\pm$~0.03       & 15.39~$\pm$~0.07& --1.97~$\pm$~0.18       &  $\rm 0.039^{+0.04 }_{-0.010}$ &		    & Y,D      \\ % 34252 C, S 
\object{S~Ori 36}		       & 05 39 26.85   & $-$02 36 56.2  & 17.68~$\pm$~0.03       & 15.40~$\pm$~0.07& --1.97~$\pm$~0.18       &  $\rm 0.039^{+0.04 }_{-0.010}$ &		    & Y,D      \\ % 34332 C, 36 
\object{S~Ori J053854.9--024034}      & 05 38 54.92   & $-$02 40 33.8  & 18.71~$\pm$~0.04       & 15.69~$\pm$~0.10& --2.02~$\pm$~0.18       &  $\rm 0.037^{+0.03 }_{-0.009}$ &		    & D,New    \\ % 41267 -- ?L? 
\object{S~Ori J053918.1--025257}      & 05 39 18.13   & $-$02 52 56.3  & 18.64~$\pm$~0.04       & 16.12~$\pm$~0.08& --2.25~$\pm$~0.18       &  $\rm 0.028^{+0.012}_{-0.007}$ &		    & D        \\ % 11387 C, C04, GG06
\object{S~Ori 42}		       & 05 39 23.41   & $-$02 40 57.6  & 19.05~$\pm$~0.03       & 16.49~$\pm$~0.10& --2.39~$\pm$~0.18       &  $\rm 0.025^{+0.006}_{-0.010}$ & M7.5~$\pm$~0.5  & Y,D      \\ % 41389 C, 42 
\object{S~Ori 45}		       & 05 38 25.58   & $-$02 48 37.0  & 19.48~$\pm$~0.02       & 16.73~$\pm$~0.07& --2.47~$\pm$~0.18       &  $\rm 0.023^{+0.006}_{-0.010}$ & M8.5~$\pm$~0.5  & Y        \\ % 23438 C, 45 
\object{S~Ori J053929.4--024636}      & 05 39 29.38   & $-$02 46 36.5  & 19.75~$\pm$~0.03       & 16.96~$\pm$~0.16& --2.56~$\pm$~0.18       &  $\rm 0.021^{+0.005}_{-0.010}$ &		    &	       \\ % 43639 C, C04, GG06
\object{S~Ori 51}		       & 05 39 03.22   & $-$02 30 20.7  & 20.22~$\pm$~0.03       & 17.06~$\pm$~0.12& --2.55~$\pm$~0.18       &  $\rm 0.021^{+0.005}_{-0.010}$ & M9.0~$\pm$~0.5  & Y        \\ % 31624 C, 51 
\object{S~Ori 71}		       & 05 39 00.30   & $-$02 37 06.7  & 20.03~$\pm$~0.03       & 17.23~$\pm$~0.07& --2.67~$\pm$~0.18       &  $\rm 0.019^{+0.005}_{-0.010}$ & L0.0~$\pm$~0.5  & Y,D      \\ % 34380 C, 71 
\object{S~Ori J053849.5--024934}      & 05 38 49.59   & $-$02 49 33.3  & 20.08~$\pm$~0.02       & 17.30~$\pm$~0.08& --2.70~$\pm$~0.18       &  $\rm 0.018^{+0.005}_{-0.010}$ &		    & D        \\ % 21426 C, C04 
\object{S~Ori 47}		       & 05 38 14.62   & $-$02 40 15.4  & 20.49~$\pm$~0.02       & 17.37~$\pm$~0.08& --2.68~$\pm$~0.18       &  $\rm 0.019^{+0.005}_{-0.010}$ & L1.5~$\pm$~0.5  &	       \\ % 24042 C, 47 
\object{S~Ori 50}		       & 05 39 10.81   & $-$02 37 15.1  & 20.48~$\pm$~0.03       & 17.50~$\pm$~0.07& --2.75~$\pm$~0.18       &  $\rm 0.017^{+0.005}_{-0.009}$ & M9.0~$\pm$~0.5  &          \\ % 34433 C, 50 
\object{S~Ori 53}		       & 05 38 25.12   & $-$02 48 02.7  & 20.93~$\pm$~0.02       & 17.92~$\pm$~0.06& --2.92~$\pm$~0.18       &  $\rm 0.014^{+0.005}_{-0.008}$ & M9.0~$\pm$~0.5  &	       \\ % 23417 C, 53 
\object{S~Ori J053944.5--025959}      & 05 39 44.55   & $-$02 59 58.9  & 20.74~$\pm$~0.04       & 18.04~$\pm$~0.08& --3.00~$\pm$~0.18       &  $\rm 0.013^{+0.005}_{-0.007}$ &		    &	       \\ % 14218    C04roiz 
\object{S~Ori J054007.0--023604}      & 05 40 06.95   & $-$02 36 04.7  & 21.14~$\pm$~0.03       & 18.22~$\pm$~0.07& --3.05~$\pm$~0.18       &  $\rm 0.012^{+0.005}_{-0.007}$ &		    &          \\ % 34081 D? C04roiz 
\object{S~Ori J053956.8--025315}      & 05 39 56.83   & $-$02 53 14.4  & 21.25~$\pm$~0.04       & 18.27~$\pm$~0.08& --3.06~$\pm$~0.18       &  $\rm 0.012^{+0.005}_{-0.007}$ &		    &	       \\ % 11467 C, C04, GG06
\object{S~Ori J053858.6--025228}      & 05 38 58.55   & $-$02 52 26.7  & 22.19~$\pm$~0.05       & 18.61~$\pm$~0.08& --3.12~$\pm$~0.18       &  $\rm 0.011^{+0.005}_{-0.006}$ &		    &          \\ % 11253 D? C, C04, GG06
\object{S~Ori J053949.5--023130}      & 05 39 49.52   & $-$02 31 29.8  & 22.04~$\pm$~0.04       & 18.89~$\pm$~0.10& --3.29~$\pm$~0.18       &  $\rm 0.008^{+0.005}_{-0.004}$ &		    & New      \\ % 32240 C, sok 
\object{S~Ori 60}		       & 05 39 37.50   & $-$02 30 41.9  & 22.52~$\pm$~0.05       & 19.05~$\pm$~0.10& --3.31~$\pm$~0.18       &  $\rm 0.008^{+0.005}_{-0.004}$ & L2.0~$\pm$~1.0  &	       \\ % 32003 C, 60 
\object{S~Ori 62}		       & 05 39 42.05   & $-$02 30 32.3  & 22.52~$\pm$~0.05       & 19.18~$\pm$~0.10& --3.38~$\pm$~0.18       &  $\rm 0.008^{+0.005}_{-0.004}$ & L2.0~$\pm$~1.5  &	       \\ % 31669 C, 62 
\object{S~Ori J053844.5--025512}      & 05 38 44.56   & $-$02 55 12.4  & 22.77~$\pm$~0.06       & 19.31~$\pm$~0.08& --3.42~$\pm$~0.18       &  $\rm 0.007^{+0.005}_{-0.004}$ &		    &	       \\ % 21672 C, nMR
\object{S~Ori J054008.5--024551}      & 05 40 08.49   & $-$02 45 50.3  & 22.80~$\pm$~0.07       & 19.43~$\pm$~0.16& --3.48~$\pm$~0.18       &  $\rm 0.007^{+0.005}_{-0.004}$ &		    &	       \\ % 43377 -- *, nMR 
\object{S~Ori J053932.4--025220}      & 05 39 32.42   & $-$02 52 20.3  & 22.83~$\pm$~0.07       & 19.54~$\pm$~0.08& --3.53~$\pm$~0.18       &  $\rm 0.007^{+0.004}_{-0.003}$ &		    &	       \\ % 11231 C, nMR 
\object{S~Ori J054011.6--025135}      & 05 40 11.58   & $-$02 51 34.6  & 22.95~$\pm$~0.07       & 19.69~$\pm$~0.09& --3.59~$\pm$~0.18       &  $\rm 0.006^{+0.004}_{-0.003}$ &		    & New      \\
            \hline
         \end{tabular}
\begin{list}{}{}
\item[$^{a}$] Entries for which there is a clear spectroscopic youth indicator
or evidence of disc, or are firstly identified in this work are marked by
"Y'', "D'', and "New'', respectively.  
\end{list}
   \end{table}