To enrich our analysis, we also considered one additional system in this comparison between the fibers, referred in the following as fiber (3). This is a variant of fiber (1), composed of identical monomers, but having decreased interactions between the cores. In our CG models, this is obtained by lowering the partial charges present in the dipole mimicking the hydrogen bonding between the monomers (see Computational Methods). While this system is not meant to model a real chemical system, it is useful to investigate the role of molecular interactions in determining the presence and the stability of defects. The behaviour of fiber (3) -which possesses artificially weakened directional interactions between its monomers -is somewhat intermediate between fibers (1) and (2)