NIKA2 skydip-based opacities consistency checks. a: vs median-filtered time-stamped IRAM 225 GHz taumeter opacities (see Sect. 7.1.1). For illustration purposes, the modelled correlations relying on an ATM model integrated in NIKA2 frequency bands are shown in black. b: stability against the observing elevation. The ratio between the skydip-based opacities and the taumeter-derived opacities is shown as a function of the observing elevation as blue points for Uranus scans, and empty red squares for MWC349 scans. See discussion in Sect. 7.2.