Fig. 2
Transmission curves of the filters used in this paper from DECam, GMOS, Gaia, FORS26, and VIRCAM. The spectrum of the typical RGB star 2MASS J16232694-2631313 from the X-Shooter spectral library (Gonneau et al. 2020) with (Teff, log(g), [Fe/H]) ≈ (4500 K, 1.6,−1.0) (Arentsen et al. 2019) is displayed for reference. The CaT region is highlighted in grey and matches the peak flux of the spectrum.
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