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The static radiative transfer equation in 3D may be written

(1) 
where
is the specific intensity at frequency
, position , in the direction ,
is the emissivity at frequency
and position , and
is the total
extinction at frequency
and position . The source function
. Here, we will work in the steadystate so that
, and in Cartesian coordinates so
the
and the direction is
defined by two angles at the position .
Peter Hauschildt
20060109