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Comparison of Ca XIII (or Ca12+) effective collision strengths between our work (PW) and Landi & Bhatia (2005, L05) as included in the CHIANTI atomic database v10.0.1 (C-1001). The top two panels are allowed transitions from the ground (131.22 Å) and metastable (161.74 Å) levels. The bottom two panels are forbidden transitions (648.70 Å and 1133.76 Å).
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