Solar dipole gain reconstructed ring-by-ring for one HFI bolometer. The thin black line represent the raw values, and the thick cyan line is a smoothed rendition with a width of 50 rings (about 2 days). We have indicated the conventional boundaries of the surveys as black vertical lines. The orange vertical dashed lines indicate the interval in which we compute the gain (computed between rings 2000 and 6000, or approximately days 60 and 190). The red curve shows the smoothed gain variation shifted to match the repetition in Surveys 3 and 4 of the scan strategy followed in Surveys 1 and 2 (note that the scan strategy for Survey 5 differs from that of Survey 3). The grey band highlights a ± 0.5% excursion around the averaged gain . The observed ~1% variations explain the large-scale residuals seen in Fig. 1.