Change in bias (sub-top panels) and σ (sub-bottom panels) as a function of the true physical parameter value for RF at z = 0.3. Top panels: results of, from left to right, the mwa, uwa, and metallicity for S/N = 10 (black), 20 (blue), and 30 (red). Note that while the S/Ns for the spectral indices change, the uncertainties assumed for the photometric data remain unchanged for the different cases. For the bias plot, the dashed green line indicates the zero point. Bottom panels: results for the sSFR, A_V, and t_mod/τ.