Similar to Fig. 4, but for the IC X-ray luminosity expected in the case of wind-like CSM (L_IC ∝ L_bol) (see Sect. 3.2). Different line types show the results for different mass-loss rates Ṁ (for a wind velocity of v_wind = 100 km s^-1). The thick lines are calculated by using the observed bolometric luminosity light curve (L_bol) of SN 2005hk (Phillips et al. 2007). The corresponding results (thin lines) from the “N5def model” of Kromer et al. (2013) are also shown for a comparison.