Fig. 1.
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Minor-to-major axis ratios in the radio continuum and optical light. Data points are from LoTSS DR2, and CHANG-ES galaxies are located to the left of the vertical dashed line. Data points are coloured according to their radio-to-optical axis ratios. Radio halos are particularly prominent if (a/b)radio ≥ 2(a/b)opt, as indicated by the orange line.
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