... in Tycho-2 are significantly larger than the x,y errors of UCAC observed images ... Observed profiles of stellar images are fitted with a two-dimensional Gaussian model ...
... E ? Image is at edge of plate . G ? Position and BD number taken directly from AGK and precessed to 1900 . M ? ... M ? Multiple images used. Only one intensity is included (both are in the published catalog, however) . R ? ...