Fig. 13.
Spectral index of the total intensity between λ20.5 cm and λ3.6 cm at 
HPBW, calculated at pixels where I at both frequencies exceeds two times the rms noise. Contour levels are at 0.2, 0.5, and 0.8. Background sources have been subtracted. The HPBW is indicated in the bottom left corner. The coordinate system is rotated by −53°.
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