Relative color-magnitude variations in optical and H-band REM data. Dotted lines indicate the extinction vector for several extinction laws (R_V = 3.3, 5.0 and 8.0, derived following Schlegel et al. 1998). High-cadence data are plotted in blue, while remaining data are shown in black. All magnitudes are relative to the median value in each filter. Black arrow on the left of the first panel shows the correlation direction for cases where g′ is also used to calculate the color, showing 3× the average uncertainty.