Example of the continuum-normalized LAMOST spectrum of KIC 9542218 in three spectral regions (dots). The best template found by ROTFIT for each spectral region is overplotted with a thin red line. The difference between the two spectra is shown in the bottom of each panel with a blue full line. We note the large residual of the fit in the first region where a mid-F type template (HD 150453) is not able to reproduce either the Balmer lines or narrower absorptions, such as the Fe i λ 4057 Å lines. The spectrum at red wavelengths is instead well reproduced by a cool giant template.