As in Fig. 25, the plots show the error distribution for a thousand simulations after applying frequency switching. For the first method, Sect. 4.3, the resulting histograms are somewhat smaller, which can be attributed to the slightly smaller residual baseline rms (~80   mK for frequency switching,  ~120   mK for position switching) in our simulations. The situation is much worse when using the second calibration scheme, Sect. 4.4. The distributions are broader, even more so in the SW case, owing to the relatively small difference between f and f^cal.