Filter profiles of the three bands used in this work (VIS from 550 to 900 nm, F606W and F814W) along with some stellar spectra of different types from Pickles (1998). For display purposes, the spectra have been normalised by their total flux in the VIS band and plotted in arbitrary units of flux. Note that to simulate stellar images, we must integrate over the wavelength-dependent PSF models, using spectra in units of photon number counts.