title radiation dominated H, He gas goes to STE
c
c commands controlling continuum =========
black body, t = 50000 STE
atom h-like collisions off // this would mask radiative processes
c
c commands for density & abundances =========
hden 4
init file="hheonly.ini"
element helium abundance 0 // raise He abundance to H
c
c commands controlling geometry  =========
stop lyman continuum optical depth -6
set dr -10
stop zone 1
c
c other commands for details     =========
iterate
no free-free heating // this would be a major thermal agent, turn off
no compton // get rid of major heat to expose remaining
set temperature convergence 0.002
c
c commands controlling output    =========
print populations h-like
print heating
print departure coef
print line faint -1
save overview "limit_lte_hhe_induc.ovr"
save performance "limit_lte_hhe_induc.per"
save monitors last "limit_lte_hhe_induc.asr"
c
c commands giving the monitors    =========
// >>chng 00 mar 21 pump rate, contin binning bugs, change err from .01 to 0.02
monitor hydrogen 2 temperature 50000 error 0.02
// >>chng 00 mar 21 pump rate, contin binning bugs, change err from .01 to 0.02
monitor helium 3 temperature 50000 error 0.02
// >>chng 12 feb 27 change from 1 to 0.9978; Upgrade to Chianti 7
monitor departure coef h-like hydrogen average = 0.9978
// >>chng 00 mar 21 pump rate, contin binning bugs, change err from def to 0.2
monitor departure coef h-like helium average = 1 error 0.2
c limit_lte_hhe_induc.in
c class limit 
c ========================================
c 

This is a H, He-only gas that is optically thin in the Lyman continuum.  It is
irradiated by a blackbody in strict thermodynamic equilibrium.  The tests confirm
that the gas temperature equilibriates close to the black body temperature.