Examples of the kernel density distributions of the [J-H]/[H-K] diagram with changing bw_method parameter. The bw_method values are from 0.5 to 0.9 and are shown in steps of 0.05 from the upper left to the bottom right. Gray distributions are the same as Fig. 3, and orange contours are derived kernel density distributions. Blue solid lines are estimated reddening vectors for each figure.