Normalization N_QSP of the excess component as a function of inFOV − outFOV for MOS1 (left) and MOS2 (right). The gray points show individual blank-sky observations whereas the red points show the stacked results in bins of inFOV − outFOV. The blue solid line and shaded area show the fit to the data and the 1σ error envelope around the model, whereas the cyan shaded area shows the intrinsic scatter of the relation.