Fig. 11
Hα source function comparisons for the FCHHT-B model. Solid: Planck function and total source function at line center. The latter has ticks at τν0 = 3,1,0.3. Dotted: line source function 
, differing from the total source function only at the very top of the atmosphere. Dashed and dot-dashed: two-level approximation 
and profile-averaged mean intensity 
. These coincide everywhere.
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