Diagram illustrating, for different core-collapse SN types, their relative rates and the types of progenitors and their respective frequencies. Initial mass ranges (indicated in parenthesis) and SN types are based on the criteria outlined in Georgy et al. (2012), assuming that the minimum amount of He in the ejecta to produce a SN Ib is 0.6 M_⊙. The upper and lower panels refer to rotating and non-rotating models, respectively.