IMFs resulting from various mass conversion efficiencies and fragmentation scenarios, all applied to the W43-MM2&MM3 CMF of Fig. 5a (blue histogram). Panel a: IMFs predicted for a constant mass conversion efficiency of 50% (red histogram), linear with the mass (yellow histogram), and dependent on the core density (Louvet et al. 2014, cyan histogram; see Sect. 6.2). Panel b: IMFs predicted by the two extreme fragmentation scenarios in Sect. 6.3: thermally supported Jeans fragmentation (black) and the analytic fragmentation function leading to a Salpeter slope (green histogram). Panel c: IMFs predicted by the hierarchical cascade scenario of Thomasson et al. (subm.), leading to binary fragments. A 2:1 mass partition and two mass conversion efficiencies, constant at 50% (orange histogram) or linear with the mass (gray histogram), are assumed. The number of fragments is taken as the lower integer, with a minimum of 1.