Typical comparisons between XSL and best-match GSL energy distributions for stars with relatively low metallicities according to XSL DR2 and with DR2-T_eff between 4000 and 5000 K. The comparisons are shown for the parameters that minimize the combined inverse-variance weighted χ² over allwavelengths (Eq. (2)). The upper left panels show all wavelengths at R = 500, the other panels are zooms into these same comparisons, at R = 3000. The best-match synthetic spectra are in red; the empirical spectra in black, except in the upper left panel where they are shown in blue, black, and blue for the UVB, VIS, and NIR arms of X-shooter. Below each spectrum, the residuals are shown together with positive and a negative version of the XSL error spectrum (cyan). Gravity increases from top to bottom: HD 165195 (X0232), HD 1638 (X0258), NGC 68381037 (X0705), LHS 1841 (X0572), LHS 343 (X0906). Compare with Fig. C.5.