... Previous: The Sliding-Cell Detection Program for Chandra X-ray Data . ... SLIM is a program developed at ST-ECF to simulate direct and slitless spectroscopic images. ... SLIM produces slitless spectroscopy simulations which include the effects of geometric distortions, fringing, and the field-dependence of the spectral dispersion. ... A slitless spectroscopy simulator was required to create realistic data of the upcoming Advanced Camera for Surveys (ACS) slitless spectroscopic modes. ...