the effective DR rate coefficient for several densities. Our modified suppression formulation for $x>0$, using Eqs. \[eqsuppression2\] and \[eqsmod\], ensures that the high-$T$ peak, corresponding to the $n\rightarrow\infty$ Rydberg series of resonances, is suppressed but the low-$T$ peak, corresponding to the $n=4$ resonances, is not suppressed. ](Fig5.eps){width="\textwidth"}

In order to make a smooth transition from the high-$T$ suppression factor $S\left(x;q,T\right)$ given in Eq. \[eqsuppression2\], which is appropriate for the high-$T$ peak region $kT\approx kT_{max}=2\epsilon_N/3$, to the low-$T$ region, where $S^N \rightarrow 1$, we use the modified factor $$\begin{aligned}
S^N(x;q,T) & = & 1 - \left[ 1 - S\left(x;q,T\right) \right]\, \exp\left(-\frac{\epsilon_N(q)}{10kT}\right) \ ,
\label{eqsmod}\end{aligned}$$ where $\epsilon_N(q)=8$ eV for the particular case of ($N=3$ and $q=3$). As seen in Fig. \[fig4\], the density-dependent effective DR rate coefficient, $\alpha_{DR}^{eff}(n_e,T)$, indeed satisfies the requirement that the high-$T$ peak is suppressed according to the formulation of [@badnell] whereas suppression is totally turned off for the lower-$T$ peak.

We have investigated the application of Eq. \[eqsmod\] for all ions that exhibit these same low-$T$ resonances features, namely, all isoelectronic sequences $N=\left\{3,4,7,11,12,15\right\}$, and we have found that the correct transitioning from suppression at the high-$T$-peak to no suppression at low-$T$ is indeed satisfied, provided, of course, that 