Spectral index histogram for over 550 000 matched sources between NSSS and TGSS using a 22.5′′ search radius (the NVSS beam radius). The median spectral index is –0.73 (dashed line). The top and bottom ten percent of the sources lie above –0.43 and below –1.00, respectively (dotted lines). This source match is not corrected for any selection effects.
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