Numerical spectral types automatically derived from the ﹩{{\rm{H}}}_{2}{\rm{O}}﹩-K2 index vs. our visually determined spectral types. The points are color-coded based on the EW-based temperature estimate resulting from the Newton et al. (2015) relations. The gray shaded region denotes spectral types that fall within one spectral type of a one-to-one relation. For reference, the rainbow shading also denotes the spectral type ranges. We assigned visual spectral types at integer values, but the points are horizontally offset for clarity.