Fig. 3
Radio spectrum of the M 87 core region in log-log scale. Different KVN observing epochs are indicated by different colors in the legend. The arrows indicate upper and lower limits. References of other multi-frequency flux information (in order of increasing radio frequency): Pushkarev & Kovalev (2012); Lister et al. (2016); Doeleman et al. (2012); Akiyama et al. (2015).
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