Effects on the 143/100 ratio of changes in the mask, choice of detectors, and detector recalibration. Solid lines indicate ratios calculated with mask G22; dashed lines indicate mask G35. Use of detector sets gives the cyan curves with recalibration turned on and the red curves with recalibration turned off. Use of full-frequency half-ring cross spectra, as in Sect. 3, gives the blue curves. The cyan curves are comparable to the green curves in Fig. 14, which also have intra-frequency calibration and foreground corrections applied. The blue-dashed curve agrees extremely well with the blue curve in the bottom right panel of Fig. 6, as it should (see text).