Median residuals per pixel over the field of view between the calibrated and the synthetic Gaia values (CaHK_calib − CaHK_syn) for run 19Am06 that is affected by the sharp feature. Step 0: results after applying only the regular model. Step 1: the masked region of the feature is defined as region A (gray) and the rest is region B, which has been corrected by applying the regular model only on region B. Step 2: after applying the modified model on region A, the sharp feature is removed. The corrections in region B are the same as in Step 1.