The ﹩r-K﹩ as a function of K, showing star‐galaxy separation and ERO definition. The diagonal upper limit in the measurements is due to the 5 σ r‐band limit from the SDSS assigned to nondetections, while the horizontal line marks the ﹩r-K=5.50﹩ color used to define EROs. Red points are objects classified as stars, while black points are galaxies. The diagonal line represents ﹩r=21.0﹩, below which the SDSS star‐galaxy separation is used. No star‐galaxy separation is done for objects above this diagonal line and to the right of the vertical line at ﹩K=17.0﹩. Open circles represent 2 σ ﹩r-K﹩ lower limits for the target radio galaxies in these fields.