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Hexbin plots of the comparison of the Si VII (or Si6+) effective collision strengths between our work (ϒ1) and Sossah & Tayal (2014, ϒ2) at T = 1.00 × 104 K (left) and 4.00 × 105 K (middle), and 2.00 × 106 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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