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Excess free energies of fusion intermediates in the standard model are shown at a tension of γ/γ0 = 0.1. Solid curves indicate stalk/hemifusion intermediates and dashed curves fusion pores. The bilayers consist of AB diblocks of two different lengths and architectures. The first diblock is described by N segments and f1 = 0.4, and the second diblock by 
segments with 
and 
From top to bottom, the volume fractions of type 2 diblocks in the bilayers are 0.00, 0.04, 0.11, and 0.17.
