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Table E.1:

Near-infrared and proper motions for the new candidate membersa of $\sigma $ Orionis identified in the GCSb.
IAU Namesc Z Y J H K $\mu_{\alpha}\cos{\delta}$ $\mu_{\delta}$
  mag mag mag mag mag mas/yr mas/yr
UGCS J053649.28-024354.4 14.363 $\pm$ 0.003 13.876 $\pm$ 0.002 13.315 $\pm$ 0.002 12.666 $\pm$ 0.002 12.352 $\pm$ 0.001 2.1 -1.3
UGCS J053649.97-023522.6 14.931 $\pm$ 0.004 14.424 $\pm$ 0.003 13.849 $\pm$ 0.003 13.259 $\pm$ 0.002 13.003 $\pm$ 0.002 -3.6 -1.2
... ... ... ... ... ... ... ...
UGCS J054020.79-022400.1 18.688 $\pm$ 0.044 17.666 $\pm$ 0.023 16.886 $\pm$ 0.018 16.377 $\pm$ 0.025 15.789 $\pm$ 0.022 - -
UGCS J054034.08-022602.5 18.042 $\pm$ 0.026 17.331 $\pm$ 0.018 16.515 $\pm$ 0.014 15.756 $\pm$ 0.015 15.230 $\pm$ 0.014 - -
a Additional IzJ (HK) photometry is available in Béjar (2001). b The full list is ordered by right ascension and is available in the electronic version of the journal. c IAU designations include J2000 (RA, dec.) coordinates from UKIDSS GCS DR4.

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