Example spectrum of the observational particle-induced background extracted from a small region (CHIPX, CHIPY) = (1: 1024, 961: 992) of the I2 CCD. The data are extracted from the merged ACIS-stowed (black) and CDF-S blank-sky (red) observations. Upper and lower panels: present the fluxes and residuals, respectively. The data and the best-fit models are shown with the crosses and solid lines. The model components are presented with the dotted lines. We note that the spectral extraction region is far from the frame-store region so that the CTI effects are important.