The Data Processing of the LAMOST Medium-Resolution Spectral Survey of
  Galactic Nebulae (LAMOST MRS-N Pipeline)
  The Large sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST)
medium-resolution spectral survey of Galactic Nebulae (MRS-N) has conducted for
three years since Sep. 2018 and observed more than 190 thousands nebular
spectra and 20 thousands stellar spectra. However, there is not yet a data
processing pipeline for nebular data. To significantly improve the accuracy of
nebulae classification and their physical parameters, we developed the MRS-N
Pipeline. This article presented in detail each data processing step of the
MRS-N Pipeline, such as removing cosmic rays, merging single exposure, fitting
sky light emission lines, subtracting skylight, wavelength recalibration,
measuring nebular parameters, creating catalogs and packing spectra. Finally, a
description of the data products, including nebular spectra files and parameter
catalogs, is provided.
