XMM-Newton OM/UVW2 weighted count rate along the actual bandpass of the filter. The effective area is convolved with a flat SED emission (only in nominal band-pass) and with a realistic stellar emission (modelled as a black-body emission, at the effective temperature of the star, at λ > 2700 Å). Most of the photons come from wavelengths outside the nominal band-pass (λλ 2120 ± 500 Å).