Help for PHOTFIT2_HAPKE_86_LE2

PURPOSE:

In this PDF, the user is asked for the parameters and there limits needed to 
fit the Hapke-1986-two-term-Legendre-Polynomial photometric function.
If a sulution guess falls out-of-bonds then the attemp will be aborted and 
a new guess attempted.

MATHEMATICAL BACKGROUND :

bidirectional reflectance [1/str] :

r(i,e,g) = ...


REFERENCE :
Bruce Hapke, Bidirectional Reflectance Spectroscopy.
3. Correction for Macroscopic Roughness
   Icarus, Vol. 59, p.41-59, 1984
4. The Extinction Coefficient and the Opposition Effect
   Icarus, Vol. 67, p. 264-280, 1986

PROGRAMMER:

Friedel Oschuetz
Institute of Planetary Exploration
DLR
12484 Berlin (FRG)

PARAMETERS: