Reduce a broadline ACSIS science observation
This recipe is suitable for ACSIS using either the RxA3i or HARP backends.
A spatial/spectral cube whose filename is of the form aYYYYMMDD_NNNNN_SS_MMMM_cube.sdf, where YYYYMMDD is the UT date, NNNNN is the zero-padded observation number, SS is the zero-padded subsystem number, and MMMM is the first zero-padded sub-scan number for the given observation and subsystem.
A spatial/spectral cube whose filename is of the form gaYYYYMMDD_N, where YYYYMMDD is the UT date, and N is the group number. This is the coadded group file.