Time series of Hα lines of RR Lyr, ordered by increasing phase from top to bottom. Time series of ESPaDOnS spectra are interpolated to provide a 2-dimensional map of the Hα profile in the [− 200,200] km s^-1 velocity range. Velocities are given in the stellar rest frame with positive velocities corresponding to inward motion (toward the photosphere). The spectrum pulsation phase is indicated on the left edge. On the right side, the color bar indicating the flux is from 0.0 to 1.2.