Fig. B.1

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(a) Example of spectrum smoothing. The upper panel presents the raw spectrum (orange line) and the smoothed spectrum (blue dashed line). The lower panel shows the normalized spectrum from the LAMOST FITS file (orange line) and the normalized spectrum derived from the smoothed spectrum (blue dashed line). (b) Example of threshold processing for a spectrum with highly abnormal flux. The upper panel displays a raw spectrum with very high anomalous pixels (orange line) and its smoothed counterpart (blue dashed line). The lower panel shows the normalized spectrum from the LAMOST FITS file (orange line) and the spectrum corrected for anomalous pixels using a threshold (blue dashed line).
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