Radial velocity of the Hα emission line of RR Cae. Filled symbols represent the measurement of the Hα prominent from the M dwarf component. Open symbols with error bars represents the measurement from the extra emission component. The uncertainty in the data points of the M dwarf radial velocity is of the order of the size of the symbols and, therefore, are not shown in the fit. Solid lines represent least-square sinusoidal fits to the two emission components data.