Fig. 2
Measuring the integrated flux density of SNR G20.0−0.2. The polygon used to select the region of the SNR is shown in red. As we mask values below the 3σI level, choosing the negative bowls around real emission does not affect our measurement. The regions with compact emission to the northeast of the SNR (near l = 20.09, b = −0.13) are A14 H II regions, and hence excluded.
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