Ratio of the stellar masses derived from the SED modelling and the true stellar masses in the simulation as a function of optical V-band dust attenuation in the simulation. Dotted lines indicate agreement between these masses. Large symbols with error bars represent the medians in the A_V bins. When a single-component (i.e., tau or single-burst) SFH is assumed, the recovered-to-true stellar mass ratio tends to decrease with increasing A_V.