# hyb2_onc_c_strl_20190131.db
#
# Date: 20190131
# Creator: ONC team
# References:
#    [1] Suzuki et al., 2018
#    [2] Tatsumi et al., 2019.
#
# Parameter and files related to stray light removal.
#
# When phi < -7 degrees or gamma > -10 degrees (note that this model is
# not applicable when gamma < -3 degrees), stray light component is:
#
#    (I_sl * t_exp)/R_sol^2
#
# where
#
#    t_exp is the exposure time in seconds,
#    R_sol is the solar distance in au, and
#    I_sl is the model stray light image,
#
# The model stray light image is:
#
#    I_sl = i_sl * M_sl
#
# where
#
#    i_sl is the intensity of stray light, and
#    M_sl is the stray light pattern in the field of view.
#
# These two variable are further expressed by
#
#   i_sl = ( -0.0879 * phi^3 - 5.61 * phi^2 - 119.4 * phi - 603.8 )
#          * ( -0.0037 * gamma^2 + 0.113 * gamma + 0.956 ),
#
#   M_sl = M_ave + ( 0.02105 * phi^2 + 1.338 * phi + 17.02 ) * M_PC1,
#
# where phi and gamma are the angle between Hayabusa2-Sun vector and Z_SC
# and the twisting angle around Z_SC, M_ave is the stray light mean
# component and M_PC1 is the first component of the stray light of the
# principal component analysis.
#
# @attribute
# Band
# straylight mean pattern file
# straylight pc1 pattern file
# straylight pc2 pattern file
# @data
ta,hyb2_onc_c_strl_mea_taf_f_v01_20190131.fit,hyb2_onc_c_strl_pc1_taf_f_v01_20190131.fit,hyb2_onc_c_strl_pc2_taf_f_v01_20190131.fit