Pseudospherical disort as described by (), single precision
version. Warning: it is not recommended to use spsdisort for
really large solar zenith angles nor for cloudy conditions. For large
optical thickness it is numerically unstable and may produce wrong
results. To optimize for computational time and memory, please adjust
the parameters in src_f/DISORT.MXD for your application and re-compile.
Jonas Kylling
2010-03-06