Left: map of A_V vs. spectral type of one of our targets (CHA1110-7633). The order of templates on the y-axis has no significance and they are only grouped according to their ages. The spectral types prefixed with “Y” and “F” indicate the young dwarfs and old field dwarfs, respectively. The color bar indicates the normalized 1/(χ²)² value where the lowest χ² corresponds to the brightest color. The blue colored marker denotes the best-fitting spectral type and A_V with an uncertainty of 0.5 spectral subtype and 1 mag in extinction (see text for details). Right: NIRSpec spectra of the same object normalized to the flux at 1.5 μm overplotted with the best-fit template and extinction (blue) resampled to match the target resolution. The templates with ±0.5 subtype and ±1 mag in extinction are shown in different colors for comparison.