Comparison of Ca XIV (or Ca¹³⁺) effective collision strengths between the present work (M20), Dong et al. (2012, D12), and Wang et al. (2018, W18) for selected transitions listed in Table 4. The top panel is a dipole transition from the ground level. For the two dipole metastable transitions (in the second and third panels from the top), effective collision strengths C-901 are obtained directly from the CHIANTI atomic database. The vertical dashed lines indicate the temperature range originally provided by Dong et al. (2012). The brown diamonds outside this temperature range are extrapolated data in CHIANTI. The bottom two panels are forbidden transitions from the ground level to the first two metastable levels.