K-band differential galaxy number counts for OGs and DGs, compared with the entire EROs sample as in Figure 1. The solid curves with triangles show the number counts for EROs in the COSMOS, and the filled circles and open circles show the number counts for OGs and DGs, respectively. (a) EROs defined by color cut ( i − K) _AB ⩾ 2.45; (b) EROs defined by color cut ( i − K) _AB ⩾ 2.55. The error bars indicate the Poissonian uncertainties.