a) CX line fluxes as a function of ionization temperature of the impinging ions. The detailed transitions can be found in Table 1. The collision velocity is set to be 500 km s^-1. b) CX line fluxes as a function of collision velocities. The ionization temperature of the projectile ions are set to be 1.2 keV. The solid and dashed red lines show two different calculations of the Ne x CX. The solid, dotted, and dash-dotted blue lines are the S xv CX lines assuming l-population functions of low-energy I (LE1), statistical weight (SW), and low-energy II (LE2), respectively (see Gu et al. 2016a, for their forms).