Upper panel: the light curve of MOA-2007-BLG-197 and the best-fit model (solid line) with a zoom on the caustic exit on the right-hand side. On the left-hand side, the structure of the resonant caustic is drawn in red, as well as the trajectory of the source, in black (axes are in Einstein radius units). The source is too small to be distinguished. The four intervals E₁₋₄ indicate time intervals where possible source caustic crossing (caustic entry) have been investigated. Lower panel: the residuals of the best-fit model.