Table 4: Near-infrared follow-up photometry of our $\sigma $ Orionis cluster members and candidates.
\begin{displaymath}\small\begin{tabular}{l c c c c c c c c c} \hline \hline \... ... & -- & 1000 \\ % \noalign{\smallskip } \hline \end{tabular} \end{displaymath}
a
Source of the infrared photometry. Three first digits ( $JHK_{\rm s}$): 0 - not available; 1 - this work; 2 - 2MASS; 3 - Martín et al. (2001). Fourth digit (IRAC passbands): 0 - object in any IRAC channel area; 2 - object in two IRAC channel areas; 4 - object in four IRAC channel areas.

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