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Published online by Cambridge University Press: 19 September 2016
Detailed, multi-frequency radio observations of supernovae have shown that the radio emission can be understood as a blastwave interacting with a structured circumstellar medium (CSM) and modeling of the radio light curves allows estimation of the physical conditions in this medium. CSM structures, properties of the presupernova system, and the evolution of the system in the last stages before explosion can then be derived.