Stacked M_HI/M_* as a function of g − r color. Small black dots show individual FASHI-detected field galaxies. Colored symbols with error bars denote the stacked 〈M_HI/M_*〉 measurements for cluster member galaxies in different projected cluster-centric distance bins, as indicated in the legend. Different symbols represent the three stellar mass bins: triangles for ﹩8.5\lt \mathrm{log}{M}_{* }/{M}_{\odot }\lt 9.5﹩, squares for ﹩9.5\lt \mathrm{log}{M}_{* }/{M}_{\odot }\lt 10.5﹩, and circles for ﹩\mathrm{log}{M}_{* }/{M}_{\odot }\gt 10.5﹩. Error bars include both the stacked spectral rms uncertainty and a 10% flux calibration error. The cluster stacked measurements lie systematically below the field galaxy distribution at all g − r colors, indicating that H I depletion is already present even among optically blue (or star-forming) cluster galaxies.