Gray cloud effects in the spectral indexes introduced in Figure 13. With red squares we show the clear atmospheric scenario and with colored lines the gray cloud deck at various pressure levels. With the shadowed gray area, we show the 1σ variation of all the bare rock scenarios simulated in this work. The example shown is the 1 bar surface pressure at various oxidation states for a_c = 10⁻⁶. With this figure we emphasize that gray clouds introduce degeneracies between bare rocks and atmospheres even for highly oxidized atmospheres.