Same as Fig. 10, but with the distribution of the Δm₁₅ parameter against the pEW of the Si II 5972 Å line (upper panel), and against the Si II ratio R(Si) (lower panel). Data shown in red, blue, green, and orange symbols are taken from Burrow et al. (2020) and respectively colour-coded according to the Branch spectroscopic sub-classes – SS, BL, CL, and CN. SN 2020ue and SN 2020nlb are highlighted as black and red stars, respectively.