the zero-density value and then used more generally. Also, @davidson simplified the collisional-radiative approach of @burgsum and, using hydrogenic atomic data, determined suppression factors for Li-like and . New calculations for were made by @badnell utilizing more advanced (generalized) collisional-radiative modeling [@sumhoop] and much improved atomic data at collisional plasma temperatures (see the references in @badnell).

All of the above works were for electron collisional plasmas and used rather basic DR data (excluding @badnell) as epitomized in the @burgess General Formula, viz. a common dipole transition for dielectronic capture, autoionization, and radiative stabilization. The purpose of the present paper is to explore density suppression of DR in photoionized plasmas, and within collisional plasmas, using state-of-the art DR data which takes account of a myriad of pathways not feasible in the early works above, but which has been shown to be necessary by comparison with experiment. We wish to gain a broad overview utilizing the large test-suite maintained by the plasma simulation code Cloudy. We utilize an approach to DR suppression which is motivated initially by the detailed collisional-radiative results given in @badnell for at $T=10^5$ K, along with known scalings to all temperatures, charges, and densities. Using these results as 