Observed (V,Ks) APMs of 2533 TGAS F5V stars with a parallax error of less than 10%, as a function of their distance modulus. For the stars located at a distance modulus of less than six, the dispersion of the APMs is five times larger than the dispersion due to the photometric and the astrometric noises. Beyond a distance modulus of six, indicated by the vertical red broken line, the APMs begin to decrease. This behavior together with the large APM dispersion may be explained by both multiplicity and observational bias (see text).
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