Chapter 8: Slitless Spectroscopy with WFC3 8.1 Grism Overview 8.2 Slitless Spectroscopy with the UVIS G280 Grism 8.3 Slitless Spectroscopy with the IR G102 and G141 Grisms 8.3.1 IR G102 8.3.2 IR G141 8.4 Sensitivities and Exposure-Time Estimation 8.5 Extraction and Calibration of Spectra 8.6 Slitless Spectroscopy with Spatial Scanning