Fig. 3
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1 GHz surface brightness versus diameter for the Vukotic et al. (2019) sample of Galactic SNRs with known distances (blue) and the Urosevic et al. (2005) sample of extragalactic SNRs. The purported Calvera SNR was plotted in red using the measured surface brightness at 144 MHz and the best-fit spectral index of 0.71, and the 54 pc diameter derived from the 3.3 kpc distance estimate of Mereghetti et al. (2021).
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