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Table 1

Classes of objects among Gaia simulations used for testing OA algorithms.

Class Description

AFGKM Main sequence stars, from PHOENIX model
OB Very hot OB stars
WD White dwarfs, both DA and DB
UCD Ultra cool dwarfs stars
GALAXY Semi-empirical galaxies
QSO Semi-empirical quasars
PN Semi-empirical planetary nebulae

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