title test conditions of very low ionization matrix solver
c
c commands controlling continuum =========
blackbody 50000
ionization parameter -30
c
c commands for density & abundances =========
hden 2
init file "hheonly.ini"
c
c commands controlling geometry  =========
stop zone 1
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c other commands for details     =========
no molecules
constant temperature 100
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c commands controlling output    =========
save overview "limit_lowion.ovr"
save performance "limit_lowion.per"
save monitors "limit_lowion.asr" 
c
c commands giving the monitors    =========
// >>chng 04 apr 17 - fix recom conv, from -12.972 to -10.212
// >>chng 04 apr 29, from -10.212 to -10.416, He+ - H ct rate update
// >>chng 04 jul 03, from -10.416 to -12.987, NA update H, CO chem net
// >>chng 13 feb 13, from -12.99 to -12.62, H2,e-=>H-,H + const p improvements
monitor hydrogen 2 ionization -12.62 error 0.1
//
// >>chng 04 apr 29, from -16.20 to -16.001, He+ - H ct rate update
// >>chng 04 jul 03, from -16.001 to -22.595, NA update H, CO chem net
monitor helium 2 ionization -22.595 error 0.1
// 
c limit_lowion.in
c class limit 
c ========================================
c 

This model test very low ionization solution of hydrogen and helium.