This regularization analysis is able
to discriminate between located network heterogeneities with phase separated morphology and randomly (homogeneously) distributed network heterogeneities as it has been demonstrated [31].
The studied rubber blends show a phase separated morphology (see TEM images in Fig. 1) and consequently, a bimodal spatial distribution of dipolar couplings, corresponding to the network structure for the two rubber phases, would be expected in the NMR experiments. Unfortunately the dipolar coupling distribution for the