Illustration of typical spectra at different signal-to-noise levels, with source IDs shown on the left. These spectra have empirical signal-to-noise ratios of 6, 8, 17, 28, and 15, from top to bottom. The extracted spectra are shown in yellow, with the best-fitting spectra found by spexxy overplotted in blue. The gap in the observed spectrum just blueward of 6000 Å is masked because it contains the Na D emission of the adaptive optics laser. The last source is a carbon star; as the PHOENIX library used with spexxy does not include these type of stars, the best-fitting spectrum matches the absorption lines but can only approximate the carbon features with a polynomial fit.