The diagram above shows the response curves of the ugriz photometric pass-bands with 1.3 airmass correction applied, taken from the SDSS website², compared to the MWD spectrum of two different effective temperatures and same magnetic field geometry which for this case is the 12.61 MG offset dipole model of SDSS J0855+1640. The fluxes are arbitrarily scaled, but consistent relative to each other. The effective temperatures are 20 000 K (top) and 15 000 K (bottom). The u, g and r bands cover the wavelengths which are effected by the magnetism in the MWD spectra for field strengths smaller than 50 MG. However this effect is minor for the r band.