Include optical and UV levels

To activate optical and UV levels for the atoms or O, C, C+, Si+ and H(for how to activate H) one needs to activate the switch

.true.      ! UVpumping

For details, see Appendix A.4 in Woitke et al. 2011.

You may also require the Voigt profile line profile:

.true.      ! Voigt_escape

and estimate the atom/ion-electron collision rates

.true.      ! gbar