Gaia Data Release 1
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Table A.1

Comparison of the results of the three different XM algorithms for TGAS. The number of sources in TGAS is 2 057 050.

Catalogue N matches Fraction of matches Fraction of correct matches
algorithm 1 algorithm 2 algorithm 3 algorithm 2 algorithm 3

2MASS PSC 2 045 772 99.88 74.85 99.39 74.76
UCAC4 2 042 349 99.88 28.19 99.20 28.08
GSC 2.3a 2 026 532 100.72b 63.79 95.68 60.36



See text for a discussion about GSC 2.3.


In the case of GSC 2.3 we find a few more matches with broadening than with proper motion propagation.

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