Schematic representation of the merged H II region and PDR models. ﹩P_{\mathrm{H}\,\,{}^{{\rm{\small II}}}}=P_{\mathrm{PDR}\,}﹩. Starburst99 is used for the cluster spectrum. Mappings is used for the H II region structure; emitted H II region spectrum; ﹩[ \mathrm{Fe}\,\ {}^{{\rm{\small II}}}] _{\mathrm{H}\,\,{}^{{\rm{\small II}}}}﹩, ﹩[ \mathrm{Si}\,\ {}^{{\rm{\small II}}}] _{\mathrm{H}\,\,{}^{{\rm{\small II}}}}﹩, and ﹩[ \mathrm{C}\,\ {}^{{\rm{\small II}}}] _{\mathrm{H}\,\,{}^{{\rm{\small II}}}}﹩ emission; and R_S. The emitted spectrum plus R_S gives G₀. Our PDR models give [Fe II]_PDR, [Si II]_PDR, [C II]_PDR, and H₂ emission. A_V in the H II region is ≲1, A_V in the PDR is 2, and A_V at the H I/H₂ boundary is ≲1.