+## Example input file with minimal input parameters,
comment             CH4 at 30K (2.3 and 2.4 micron band)
file_output         nk_CH4_30K_Fig6b.txt
file_spectrum       abs_CH4_30K_Fig6b.txt
file_substrate      au_nk.txt
thickness_cm        1.540E-04
visible_index       1.32
goal                1.00E-05
step_adapt          True
step                0.1
step_dnrate         0.02
step_interval       2
step_max            0.1
step_min            1.0E-3
step_uprate         0.01
approx_terms        -0.001
xrange1             4350
xrange2             4150
input_angle         8.5