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Hexbin plots of the comparison of the Fe XIX (or Fe18+) effective collision strengths between our work (ϒ1) and Butler & Badnell (2008, ϒ2) at T = 1.80 × 105 K (left) and 3.61 × 106 K (middle), and 7.22 × 107 K (right). The darker the colour, the greater the number of transitions log10(N). The diagonal line in red indicates ϒ1 = ϒ2.
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