Mean distances of nearby stars (from Gliese & Jahreiß 1991) with 10% accurate parallaxes vs. their proper motions. The number of stars in each proper motion bin is given at the top. The last two bins are wider to have enough stars per bin. Error bars show the width of the distribution in each bin. Known  >T5 dwarfs with parallaxes (from the compilation of Gelino et al. 2011, supplemented by data from Marocco et al. 2010; Liu et al. 2011; Luhman et al. 2011, and Subasavage et al. 2009) are overplotted as red crosses.