Sample CARMENES spectra (order 25) of Kepler-1625 and comparison to synthetic spectrum. Panel a: CARMENES spectrum of a relatively high-S/N observation (ID 4) with blue showing the data from the CARACAL pipeline. The black line represents a binning of the spectrum for illustrative purposes only and to assist the human eye in separating spectral lines from noise. We did not use the binned data for our spectral analysis. Seven data points were used for binning. Panel b: CARMENES data of a relatively low-S/N observation (ID 8) with orange showing the CARACAL pipeline data and black showing the binned data. Panel c: synthetic PHOENIX spectrum of a model star akin to Kepler-1625, with T_eff = 5600, log (g) = 4.0, and [Fe/H] = 0.