Distribution of the specific angular momenta, j, for protostars. (a)–(d) Show JK04’s model M6k2 with different star formation efficiencies: (a) 15, (b) 30, (c) 45 and (d) 60 per cent. (e) Binaries among nearby G stars of Duquennoy & Mayor (1991). (f) Binaries in Taurus (Simon 1992). (g) and (h) Show the distributions from paper for the clfind and gaussclumps designations, respectively, decomposed according to the designations of HFR07.