Ratio between TGAS and photometric parallaxes as a function of average G magnitude as given in the DR1 data. The red symbols show the mean and the error in the mean (based on the actual dispersion, not the nominal errors) for bins 2 mag wide; the red line shows the mean ratio in moving bins 2 mag wide centered at the magnitude in the abscissa. Note that three stars exceed the range of the Y axis and are not shown, but are included in the averages. This comparison suggests that TGAS parallaxes for very bright stars (G< 6), for which the central pixel will typically be saturated even at the shortest gating used, may be systematically underestimated.