We have confirmed that the side chain repulsion is the origin of this particular feature by constructing equilibrated model with shorted side chains (see SI section 3). As shown in To further analyze the effect of these crossing points on overall morphology, we calculated the radial distribution function (rdf) of centre of mass of BT-BT crossings. Figure shows the collective data for all three polymer models over 100 ns of simulations (four annealing cycles).