Relative gains reconstructed by bogopix for the 100, 143, and 217  GHz detectors as a function of time, smoothed with a width of 50 rings (about 2 days). Their overall amplitudes are of order 1 to 2%, but both slow and fast (over a few tens of rings, i.e., a day) variations are observed. These variations are largely independent from one detector to the other. Relative gains for each detector have been vertically displaced by 3% for clarity.