Left panels: distribution of the difference between fitted period and true period for ΔT_spot1 (solid) and ΔT_spot2 (dashed), and for the lower HZ (black), medium HZ (red), and upper HZ (green) for all simulations (and therefore all spectral types), the distribution width for all simulations vs. spectral types, and the median of the difference between fitted and true period vs. spectral type. Right panels: same for the mass.