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Extensive resonance structures are manifest in R-Matrix (RM) calculations.However, there exist a large number of highly excited electronic configurationsthat may contribute to background non-resonant bound-free opacity inhigh-temperature plasmas. Since RM calculations are very complex, and notessential for background contributions, the Relativistic Distorted Wave (RDW)method is utilized to complement ("top-up") photoionization cross sections ofFe XVII obtained using Close-Coupling Breit-Pauli R-Matrix (CC-BPRM) method.There is good agreement between RDW and BPRM for background cross sectionswhere resonances are not present, and individual fine structure levels can becorrectly matched spectroscopically, though resonances are neglected in theRDW. To ensure completeness, a high energy range up to 500 Ry above theionization threshold for each level is considered. Interestingly, thehydrogenic Kramer's approximation also shows the same energy behavior as theRDW. Grouping separately, the BPRM configurations consist of 454 bound levelswith resonances corresponding to configurations $1s^22s^22p^4nln'l'$ (n $\leq$3, n' $\leq$ 10); including RDW configurations there are 51,558 levels intotal. The topup contribution results in $\sim$20\% increment, in addition tothe 35\% enhancement from BPRM calculations over the Opacity Project value forthe Rosseland Mean Opacity at the Z-temperature of 2.11 $\times 10^6$K (Pradhanand Nahar 2017).

Converged Close-Coupling R-Matrix calculations of Photoionization of Fe XVII in Astrophysical Plasmas: from Convergence to Completeness