Above all, to make the PAMM-SOAP analysis comparable between different fibers, one needs to choose a representation of motifs that takes into consideration the common structural features between the different systems. To this end, we focused only on the packing of BTA cores, as otherwise the analysis would detect, as the most prominent feature, the fact that different systems have different side chains or solvents. Then, one needs to choose a common set of features to perform clustering and to obtain a low-dimensional representation. An option would be to pick one of the systems as a common reference and to project all the others into this one. However, projecting the data of other systems on a reference one would automatically imply that one already knows what is the system that is richest in terms of microstates (the least rich ones should be projected on the map obtained for the most diverse, as doing the opposite would lead to loss of information).