Fig. 4
Representative UMAP two-dimensional projection of CARMENES (blue) and PHOENIX spectra (S∕N = ∞ in yellow, S∕N = 150 in gray) built with the flux values from the 8800–8835 Å window. Only four CARMENES spectra show similarities with the PHOENIX feature distribution, while the rest are considerably different. Other spectral windows show a similar behavior.
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