Table 4: Number of expected field L- and T-type dwarfs in a 1 deg2-area survey towards $\sigma $ Orionis as a function of the Johnson I-band magnitude and spectral type intervala.
$\Delta I$ L0-5V L5-T0V T0-5V T5-8V
(mag)        

21.0-22.0		 $\rm 1.1^{+0.5}_{-0.4}$ $\rm0.049^{+0.034}_{-0.019}$ $\rm0.012^{+0.009}_{-0.005}$ $\rm0.008^{+0.007}_{-0.003}$
22.0-23.0 $\rm 3.9^{+1.8}_{-1.4}$ $\rm0.19^{+0.14}_{-0.08}$ $\rm0.05^{+0.03}_{-0.02}$ $\rm0.030^{+0.027}_{-0.014}$
23.0-24.0 $\rm 12^{+5}_{-4}$ $\rm0.7^{+0.5}_{-0.3}$ $\rm0.18^{+0.14}_{-0.08}$ $\rm0.12^{+0.11}_{-0.06}$
24.0-25.0 $\rm 36^{+14}_{-13}$ $\rm 2.5^{+1.7}_{-1.0}$ $\rm0.7^{+0.5}_{-0.3}$ $\rm0.5^{+0.4}_{-0.2}$
25.0-26.0 $\rm 90^{+30}_{-30}$ $\rm 8^{+4}_{-3}$ $\rm 2.5^{+1.8}_{-1.1}$ $\rm 1.8^{+1.5}_{-0.8}$
26.0-27.0 $\rm 180^{+60}_{-80}$ $\rm 24^{+14}_{-10}$ $\rm 8^{+5}_{-3}$ $\rm 6^{+6}_{-3}$
27.0-28.0 $\rm 270^{+100}_{-130}$ $\rm 60^{+30}_{-30}$ $\rm 25^{+16}_{-11}$ $\rm 20^{+17}_{-10}$
28.0-29.0 $\rm 300^{+140}_{-170}$ $\rm 130^{+60}_{-60}$ $\rm 60^{+40}_{-30}$ $\rm 60^{+50}_{-30}$

a Poissonian localized overdensities are not taken into account.

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