CalDB data directory mode (1: single region; 2: multiple regions with the required input provided in a text file) mode in [1:2] Detector number: 1-MOS1 2-MOS2 3-PN detector in [1:3] Mask image file name, usually e.g., mos1S001-obj-im-sp-det.fits Spectrum file name ASCII text file with the input for multiple regions.