The rms map of the 10 GHz observation before primary beam correction. The image size is ﹩41\,{\mathrm{arcmin}}^{2}﹩. The rms map is created with PyBDSF. The red circle indicates the HPBW of the primary beam at 10 GHz, which corresponds to ﹩4\buildrel{\,\prime}\over{.} 5﹩. The gray scale shows the rms noise from 0.8σ to 1.2σ, where σ = 0.41 μJy beam⁻¹ The contours are plotted at [0.38, 0.39, 0.41] μJy beam⁻¹.