Distribution of C-rich and O-rich VarZoo Miras in excess color planes detailed in Table 1. Red points show C-rich Miras, Blue points indicate O-rich Miras, and gray points show the rest of the VarZoo sample. Black arrows indicate the extinction law from Wang & Chen (2019) in the top panels and this study in the bottom panels. Magenta arrows show the fit for C-rich Miras from Yuan et al. (2017) in the same color planes. Dotted black lines show the derived separations between C-rich and O-rich Miras.