Phase: RAMI3BRF in the principal plane for single-scattered radiation
brfpp_co_sgl for HET01_DIS_UNI_RED_20 testcase.
brfpp_co_sgl for HET01_DIS_UNI_RED_50 testcase.
brfpp_co_sgl for HET01_DIS_UNI_NIR_20 testcase.
brfpp_co_sgl for HET01_DIS_UNI_NIR_50 testcase.