title limit_caseb_he2_den8 He II case B
c
c commands controlling continuum =========
table agn 
ionization parameter 0
c
c commands for density & abundances =========
hden = 8
element helium abundance 1
init file="ism.ini"
c
c commands controlling geometry  =========
set dr 0
stop zone 1
c
c other commands for details     =========
atom h-like element helium levels resolved 20 
atom h-like element helium levels collapsed 30 
case b hummer no photoionization no Pdest 
no induced processes (OK)
constant temperature = 5e4 K
c
c commands controlling output    =========
normalize to "Ca B" 1640 // the balmer alpha transition
save overview "limit_caseb_he2_den8.ovr"
save performance "limit_caseb_he2_den8.per"
save results "limit_caseb_he2_den8.rlt"
save monitors "limit_caseb_he2_den8.asr"
c
monitor Case B H-like helium error 0.1 range 1000 40000A faint -2
c
c commands giving the monitors    =========
monitor line "He 2"  1640A  1.0000 
monitor line "He 2"  1215A  0.3667
monitor line "He 2"  1085A  0.1771 
monitor line "He 2"  1025A  0.1013 
monitor line "He 2"  4686A  0.1053 
monitor line "He 2"  3203A  0.0544 
monitor line "He 2"  2733A  0.0314 
monitor line "He 2"  2511A  0.0200 
monitor line "He 2" 1.012m  0.0231 
monitor line "He 2"  6560A  0.0140 
monitor line "He 2"  5412A  0.0089 
monitor line "He 2"  4860A  0.0061
monitor line "He 2" 1.864m  0.0070 
monitor line "He 2" 1.163m  0.0047 
monitor line "He 2"  9345A  0.0032 0.1
// 
c limit_caseb_he2_den8.in
c class limit 
c ========================================
c 

This test case compares the predictions of the multi-level hydrogen atom
with the Storey and Hummer (1995) results.  The set dr command sets the
zone thickness to 1 cm.  The case b command sets Lyman line optical depths
to very large values. 
Checks:
-	Neutral fractions
-	H* emissivity
-	Relative line intensities