$\ge 18$ & 0.0 & 0.0 & 0.0 & 0.0 & 0.0 & 0.0\
& &\

We note that all isoelectronic sequences and ionization stages are now included in this prescription — our final comprehensive model for treating DR suppression, albeit in a simplified fashion. For those ions with fine-structure splitting in the ground state, we have $\epsilon_N(q)\approx 0$, so that $S^N(x;q,T)=S(x;q,T)$. (We apply this generally also for Ar-like sequences and above ($N\ge 18$), based-on the density of states — see, for example, [@badnell3pq].) For the closed-shell cases, on the other hand, we have $\epsilon_N(q)\rightarrow \infty$. Thus, $S^N(x;q,T)=1$ for hydrogenic and closed-shell systems, i.e., there is no suppression (for $x\le 10$). Lastly, for the intermediate cases, the suppression factor is gradually increased toward unity at lower temperatures and begins to admit low-$n$ DR resonances.

Results
=======

The suppression factors derived here have been applied to the state-of-the-art total DR rate coefficients taken from the most recent DR database.[^3] These modified data have been incorporated into version C13 of the plasma simulation code Cloudy, most recently described by [@cloudy13]. Cloudy can do simulations of both photoionized and collisionally ionized cases, and we show the effects of collisional suppression on both.

Figure 