Example of CRIRES spectra of our targets in the between 2292 and 2298 nm (the v = 2−0 band head, left panel) and between 2332 and 2340 nm (the low rotational lines, right panel). The continuum in all spectra is normalized to 1 and subsequently vertically shifted for clarity. The red line in the right panel denotes the upper limit for the line fluxes noted in Sect. 5.4 and Table B.2.
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