Upper panels: normalized distributions of the (de-reddened) colors for random Pan-STARRS sources. The vertical magenta line denotes the color of the 3C 187 core counterpart. The best-fit Gaussian components are overplotted with dashed lines of different colors, with the best-fit μ and σ indicated in the legend. Lower panels: normalized distributions of the (de-reddened) colors for Pan-STARRS sources in the field of 3C 187. As in the upper panels, the vertical magenta line indicates the color of the 3C 187 core counterpart. The color distributions are modeled with the same Gaussians used to model the random source distribution with fixed μ and σ. The additional component required to model the color distributions is indicated with a red dashed line, with the best-fit μ and σ indicated in the legend. The g − r and z − y colors require a further broad, subdominant component indicated with a green dashed line.