Fig. 3.
Left panel: spectral index map between 144 MHz − 1.5 GHz for the extended radio emission from A2146. Right panel: corresponding spectral index error map. The resolution of the maps is 30″. In both images, the LOFAR 144 MHz (blue) and VLA 1.5 GHz (grey) first contours are 2.5σ, where σ = 340 and 27 μJybeam−1 for the LOFAR 144 MHz and VLA 1.5 GHz data, respectively. The next contours are multiplied by 
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