The focus model can consist of up to 20 terms. Each term can be an arbitrary polynomial combination of temperature (in degrees Fahrenheit), elevation (in degrees), and azimuth (in degrees). No significant azimuth dependance has been seen, and is not currently fitted.
# Focus model data file
# There can be up to 20 fit terms, with different polynomial degrees of
# elevation "e" (in degrees), temperature "t" (in degrees fahrenheit)
# and azimuth "a" (in degrees).
# The constant offset can be denoted with "1".
# term 1 3.50 - constant offset
# term eet 0.00003 - temperature*(elevation^ 2)
term 1 3.4426761
term e -0.0068352
term ee 0.0000324
term t 0.0044962
term et 0.00005885
term eet -0.0000002498