Influence of the sky-background subtraction on the Budda fit in the K-band: we added a sky offset of (−3, −2, −1,1,2,3) × σ_sky to the sky subtracted images and repeated the fit. A positive sky offset means that the sky background was underestimated and therefore not completely subtracted. The plots show the hereby introduced deviation of the bulge (left) and host (right) magnitude. Positive magnitudes indicate an overestimation of the bulge/host, while negative magnitudes indicate an underestimation.