There are a coupe of corrections being made in this releasing:
Recalculated all the errors of Teff, Logg, Fe/H and rv in the AFGK catalog. Refer to the DR2 paper (in preparation) for details.
Compare to the previous internal releasing, some extra spectra have been added into this version of releasing: STAR from 3,779,597 to 3,843,597, increased 63,923; GALAXY from 37,665 to 47,036, increased 9,371; QSO from 8,633 to 13,262, increased 4,629.
The major contribution to this increasing is that we applied a new method to reduce the data which previously was abandoned due to lack of standard stars with high enough S/N ▽ . Refer to the paper ‘LAMOST Spectrograph Response Curves: Stability and Application to flux calibration’ (in preparation) for details.
There are also a small amount of increasing is due to the correction of fiber flag, and to the eye check work, etc.
The added data include six lists: