FWHM of the broad Balmer line (without CRs) as a function of the proper motion for a distance of 2 (green) and 3 kpc (red) from the Sun. The level of electron-ion equilibration varies in each of the hatched regions, with β_down = 0.01 and β_down = 1 at the upper and lower bounds, respectively. Data points show the measurements of proper motion and width of Balmer emission in different regions of the shock, as reported by Helder et al. (2013).