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NIKA2 bandpasses are described in Section 2.5 and Figure 1 of Perotto et al. (2020). They have been measured in the laboratory. The following fits file contains all 3 bandpasses: Transmission_2017_Jan_NIKA2_v1.fits: 
OLD INFORMATION, POSSIBLY OUTDATED:
The spectral bands as measured in Néel (note that the two 1.15mm arrays are pretty similar but there is a detectable difference):
