Left panel: observed, bias-corrected two-point correlations of the entire EROs (squares), OGs (triangles), and DGs (circles). The error bars on the direct estimator values are 1σ errors. To make this plot clear, we show the error bars of OGs only. Because of the small number of objects included, some bins were not populated. Right panel: the angular clustering amplitudes of the entire EROs, OGs, and DGs are shown as a function of the K-band limiting magnitudes of the sample analyzed. The solid and dashed lines represent the sample were classified by the PCA method and the SED fitting method.