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tokens: other two levels 2s2p 2 2 P 1/2 and 2s 23 d 2 D 3/2 . Fig. B.6. Same as Fig. B.1 but for four Fe XXII lines. The R -matrix data from Liang et al. (2012) are plotted in red. The R -matrix calculation of electron-impact excitation of Fe XXIII was made by Fernández-Menchero et al. (2014) , based on 238 fine-structure levels in both the configuration interaction target and close-coupling collision expansions. We compare the collision strengths for four strong Fe XXIII lines with their calculations, on which the resonance has a large effect. As shown in Fig. B.7 , the two sets of data agree very well within a difference of ≤5% for T e = 0.1 − 10 keV. Fig. B.7. Same as Fig. B.1 but for four Fe XXIII lines. The R -matrix data from Fernández-Menchero et al. (2014) are shown in red. In Fig. B.8 we compare our calculations of the total excitation of four main Fe XXIV lines with the R -matrix results reported in Liang Badnell (2011) . The R -matrix work was done with the intermediate coupling frame transformation method for 195 levels, and the Auger- as well as radiation-damping effects were both taken into account. For 3s 2 S 1/2 , 3d 2 D 3/2 , and 3d 2 D 5/2 , the R -matrix and our data agree well with ∼5%, while for 3p 2 P 3/2 , the difference between the two approaches becomes slightly larger, ∼10%, for the collision strengths at energy of ≤1 keV. Fig. B.8. Same as Fig. B.1 but for four Fe XXIV lines. The R -matrix data from Liang Badnell (2011) are plotted in red. The illustrative comparison indicates that the difference between the modern large-scale isolated resonance calculation and the recent interacting R -matrix becomes now smaller than previously reported in Badnell et al. (1994) . The two methods are well within 20% for the direct transitions from the ground states to a few selected excited levels at n = 3. As shown in Fig. 6 , some excited levels are heavily populated through cascade, indicating that the line intensities could actually be significantly affected by the excitation rate coefficients to higher states. In the following section, we will give an extensive comparison for all the relevant rates. B.3. Comparing with recent R-matrix results: Scatter plots The scatter plot in Fig. B.9 shows the comparison of the effective collision strengths from the current and R -matrix calculations, for all the excitations from the ground states. The R -matrix results are a collection of the works mentioned in Appendix B.2 . The plot confirms that the two methods agree on the strongest transitions within uncertainties of ∼20%. However, the discrepancies between the two methods on the weaker transitions are substantially larger, up to a factor of two for Fe XVII and Fe XXIV , and one order of magnitude for the rest ions, at the lowest effective collision strengths. We note that orders of magnitude difference for weak transitions are also found among different R -matrix calculations (intermediate coupling frame transformation, Breit-Pauli, Dirac atomic