Full observed wavelength range of CRIRES+ for IRAS 17163 (blue) and IRC+10420 (orange), including the telluric reference (red), with line identifications (uncertain identifications marked with ; NSO/Kitt Peak FTS atmosphere data produced by NSF/NOAO). The normalised fluxes of the sources have been manually shifted by +0.6 and +0.3 units, respectively. The panels also zoom in on the well-resolved fundamental CO rovibrational transitions and cover the higher-order P-branch lines (last 2 panels), shown for completeness despite strong telluric contamination (not included in Table A.1).