Description of our analysis flow. The “stowed” and “blank-sky”, “merged” and “each obs.”, and “whole chip” and “32 slice regions” stand for the observation types, data types, and detector regions for which the analysis processes are applied, respectively. After the gain correction part, the “merged” and “each obs.” mean the gain-corrected-and-merged data and each of the gain-corrected observation data, respectively. A schematic drawing of a CCD chip with the 32 slice regions along CHIPY, readout direction, and frame-store region is also shown.