Integrated radio continuum spectrum of SNR G15.4+0.1. The open symbols correspond to GMRT flux densities measurements at 624 and 1420 MHz. The rest of the data were taken from Brogan et al. (2006). All the data were tied to a common flux density scale (Perley & Butler 2013). The solid line shows the best fit obtained with a single power law to all the values, which yields a global spectral index α = −0.62 ± 0.03.
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