In Figure , it can be seen that the SL fraction of the gels synthesized by our method (PEG-2 and also CN5-3) is significantly lower (13-19 %) than for of the gel synthesized according to Sakai (PEG-1). This in fact applies to all co-networks mentioned in this work (see SI Table ). In comparison to earlier studies on Sakai's tetra-PEG networks, this deviation is even more pronounced. There, the SL fraction (> 60 %) is close to the value expected for a randomly linked network. The dominance of the double links over the single links in our networks is surprising.