Fig. 3.
Spectral index map (left) and relative error map (right) obtained combining LOFAR, GMRT, and VLA maps at 144, 610 MHz and 1.4 GHz, respectively. The resolution is 7″ × 7″. We report the contours at the 3, 6, 12, 24σ levels of the maps used to produce the spectral index map with continuous and dashed lines showing the LOFAR and VLA image, respectively.
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