A two-panel figure showing the change in spectral index through the centimeter radio band at 0.25 arcsec resolution. Left: ; right: . These show the dramatic steepening of the spectrum in the region of the brightest radio hot spot “H2” is not confined to the hotspot alone, but extends well beyond, in both directions. The images are blanked when the error is greater than 0.1 in spectral index.
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