Observed difference light curves of FBQ 0951+2635 in the r band. They are built from time-delay values of 16 d (ODLC1) and 13.3 d (ODLC2). For each delay, the light curve of A is time shifted, and its shifted magnitudes around the dates in B were interpolated and subtracted from the magnitudes of B. The final step is to subtract the average magnitude difference. We also show two linear fits (green and red dashed lines) to the observed microlensing signals (although they can barely be distinguished from each other in the plot).