X-ray observations for SNe Iax (red open circles) and other SNe Ia (black filled circles). Most of the data that was observed by the Swift Telescope is taken from Russell & Immler (2012). The X-ray emission of SN 2011fe and SN 2014J were observed using the Chandra X-ray observations (data obtained from Margutti et al. 2012, 2014). Theoretical predictions for different mass-loss rates Ṁ (for a wind velocity of v_wind = 100 km s^-1) are shown in different line types. The thin (thick) lines are calculated by assuming a shock velocity of 10 000 km s^-1 (5000 km s^-1).