Observed and modeled LOS magnetograms for AR 10268. (a) Magnetogram number 10 for AR 10268. (b) Most probable model for the same magnetogram obtained with σ = 10 G. (c) Magnetogram number 10 limited to the AR field defined using the most probable model shown in panel b, fulfilling the condition |B_+, j|≥1 G. (d) Most probable model for panel c data obtained with σ = 300 G. The color and contour conventions are the same as in Fig. 1. The movie mov-fig3.mp4, from the supplementary material, shows the magnetograms and their associated models during the full emergence.