The file EDR3_GDR2_GCNS_Corrections.csv contains objects that have
been observed by Gaia but to be incorrectly included or rejected from
the GCNS.
These entries fall into the following catergorie:
      1) In the rejected list (GCNS_reject) but should have been included
      2) In the accepted list (GCNS_cat) but should have been rejected
      3) In the EDR3 without a parallax but based on ground based or
         GDR2 have a reliable parallax > 10mas. 

This means all these objects have at one point been in the published
Gaia releases, objects that are not in the releases because they are
too faint, bright or what ever reason should not be in the file. As a
result all entries will have a Gaia Source ID. 

This file will be used to update the GCNS_reject and GCNS_cat files
with these corrections. The details of the solutions if they are in
the Gaia release will be taken directly from the published catalogs so
in this file only approximate values need to be provided. Anyone can
indicate corrections in the Google Doc at the space
https://drive.google.com/drive/folders/1QjZdqUYs6lJX2cPbGNm5Ss7UKYt0zvld?usp=sharing
these changes will be checked and if agreed added to the files on the
main data site.


The included columns are below, only source_id, dr, name, and
reasonname are actually required fields except when the parallax comes
from an external source in which case both parallax and
parallax_ADSBibcode are required :

source_id 	    The source ID from the latest Gaia release with a parallax
dr 		    The data release corresponding to the sourceID, 2=GDR2, 3=EDR3
objectname	    A simbad name
in100pc		    0=no -> e.g. should be rejected, 1=yes should be in GCNS_cat
parallax	    approximate parallax in mas
parallax_error 	    approxmate parallax error in mas
parallax_bibcode    the standard reference bib code
Gmag 		    approximate G magnitude
Gmagcode	    Code to indicate source of G magnitude (see below)
name		    Initials of person making proposed change (see below)
reasonname	    reason for proposed change, please do not include commas

Further details
Gmagcode: the code to indicate where the G magnitude estimate comes
from, below are the options:
      2     == Use the Gaia DR1 value	
      2     == Use the Gaia DR2 value	
      3	    == Use the Gaia EDR3 value
      21    == Used directly the GUNN r band magnitude 

name: The initials of who is making the proposed change
      RLS  == Richard Smart, richard.smart@inaf.it