Evaluation of residual color terms in the VISIONS photometry. The panels show the difference between VISIONS and 2MASS source magnitudes as a function of their J–K_s color for the J (top), H (center), and K_s (bottom) bands. The blue line indicates a linear fit, with the slope reported in the top right of each panel. The data are projected into a histogram (black) on the right-hand side. The red line on top of the histograms shows a Gaussian determined by the mean measurement errors in the source catalogs.