The selection function of the LAMOST Spectroscopic Survey of the
  Galactic Anticentre
  We present a detailed analysis of the selection function of the LAMOST
Spectroscopic Survey of the Galactic Anti-centre (LSS-GAC). LSS-GAC was
designed to obtain low resolution optical spectra for a sample of more than 3
million stars in the Galactic anti-centre. The second release of value-added
catalogues of the LSS-GAC (LSS-GAC DR2) contains stellar parameters, including
radial velocity, atmospheric parameters, elemental abundances and absolute
magnitudes deduced from 1.8 million spectra of 1.4 million unique stars
targeted by the LSS-GAC between 2011 and 2014. For many studies using this
database, such as those investigating the chemodynamical structure of the Milky
Way, a detailed understanding of the selection function of the survey is
indispensable. In this paper, we describe how the selection function of the
LSS-GAC can be evaluated to sufficient detail and provide selection function
corrections for all spectroscopic measurements with reliable parameters
released in LSS-GAC DR2. The results, to be released as new entries in the
LSS-GAC value-added catalogues, can be used to correct the selection effects of
the catalogue for scientific studies of various purposes.
