Explanation/Resolution:
The column headers are as follows:
FREQ  Frequency in cm^{1}.
TRANS  Total transmission through defined path. For example one would assume that for a downward looking
path from H1 to H2, the transmittance is from H1 to H2. For calculation of reflected solar component, one could
always use the layer by layer transmittance to calculate the total attenuation through both the downwelling and
upwelling paths.
PTH THRML  Radiance component due to the atmosphere received at the observer. This term includes the
THRML SCT component which will be 0.0 if multiple scattering is not running.
SURF EMIS  Component of radiance due to surface emission received at the observer.
SOL SCAT  Component of scattered solar radiance received at the observer. This term includes the SING SCAT
component.
GRND RFLT  GRND RFLT is the total (direct + diffuse) solar flux impingent on the ground and reflected directly
to the sensor from the ground. Thus, GRND RFLT = DRCT RFLT + Diffuse Reflected. If the downward solar flux is dominated by
the direct term, GRND and DRCT will be equal (Lex Burke, email 15Dec2003). In practice the Diffuse Reflected term will
only be significant (nonzero) if multiple scattering is selected.
TOTAL RAD = PTH THRML + SURF EMIS + SOL SCAT + GRND RFLT
REF SOL  REF SOL is the topofatmosphere solar irradiance times the Lshaped path from the suntoH2toH1.
If H2 is the ground, the DRCT RFCT is simply the REF SOL times the surface BRDF over pi steradians (Lex Burke, email
15Dec2003).
SOL@OBS  Total Solar irradiance at the observer. I believe this is similar to the REF SOL, but also includes
a contribution from the SOL SCAT term.
For the Direct Solar Irradiance option:
SOL TR  Is the transmitted solar irradiance to the observer at height H1
SOL  Is the top of the atmosphere irradiance
