a) The r+ −  color distribution of the MIPS 24μm sources as a function of redshift in the COSMOS field. Galaxies selected as OFIR sources are characterized by r + −  colors redder than the threshold indicated by the dashed line. This criterion effectively selects galaxies at 1.5 < z < 3. The typical uncertainties on the r + −  color have been calculated at 1.5 < z < 3 and are shown in the right corner. b) Redshift distribution of the OFIR galaxies with F24 μm > 0.08 mJy (blue filled histogram) compared to the redshift distribution obtained for the full MIPS-selected galaxy population in COSMOS (black solid line). c) Redshift distributions derived from the MIPS sample restricted to sources with F24 μm > 0.3 mJy (same color definitions as in (b)). The relative contribution of the OFIR galaxies at 1.5 < z < 3 increases with mid-IR luminosities.
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