What is the relation between the PI channel and photon energy?
PI = [E(eV)/3.65] You can also find this relation in the RMFs that are part of the Suzaku calibration database. • What is the difference between the 5×5 and the 3×3 data modes? Basically the difference lies in the number of pixels read out around the center of each event; in the 5×5 or 3×3 mode, the data from 25 or 9 pixels are read. Please note that there is no difference in the basic analysis (we use only the 3×3 pixels around the central pixel) and users are free to sum up spectra of both modes. Users should note that, since the FITS structure of event files are different between the 5×5 and the 3×3 modes, 5×5 and 3×3 event files cannot be combined into a single event file without loss of information. • What is the difference among the 4 XISs? Can I combine them in the analysis? We do not recommend combining data from the different XISs for analysis purposes, because XIS1 uses a Back-Illuminated CCD while the other three contain Front-Illuminated CCDs, with different properties. Mor
