Slice across the center of the 50–250λ Stokes I data cube along the frequency direction. Top left: slice after DI-calibration with only 3C61.1 subtracted; the intensity scale, converted to brightness temperature, refers to this panel. Top right: after DD-calibration where the calibration sky model, consisting of compact sources, is subtracted with their respective direction-dependent gain solutions. The intensity scale is now multiplied by 10 for improved visualization. Bottom left: GMCA model (scale also multiplied by 10). Bottom right: GMCA residuals (scale multiplied by another factor of 20). The red horizontal bands are due to data lost due to RFI-flagging. The black dashed lines border the three redshift ranges. Note the factor ∼200 reduction in intensity after GMCA.