Profiles of surface brightness (in mJy/beam), spectral index, and spectral curvature across the main filamentary features observed in Nest200047. Images at 53, 144, 400, and 816 MHz with 25 arcsec resolution were used for the measurements. The regions used are shown in the central panel and have a size equal to the beam size. Systematic uncertainties in the flux-scale were not included in the error bars as they do not affect the measured trend. The surface brightness is measured at 144 MHz, the spectral index is computed in the between 53 MHz and 816 MHz, and the spectral curvature is defined as SPC = ${\alpha }_{400}^{816}-{\alpha }_{53}^{144}$.