From the top to the bottom: the SFR expected from the CC SN rate in the sample A, B and C (thin lines) as a function of the upper mass limit for CC SN progenitors. We adopted a lower mass for CC SN progenitors of 8 M_⊙. We plot the central value and 1σ confidence limits. The short dashed line indicates the value of SFR based on L_Hα  (in all panels: sample A, B and C), the short dashed line the SFR based on L_FUV  (middle and bottom panels: samples B and C) and long dashed line the SFR based on L_Hα    + L_TIR   (bottom panel: sample C).