... About this handbook.. ... Information, software tools, and other resources are available on the WFPC2 World Wide Web page: . URL: http://www.stsci.edu/ftp/instrument_news/WFPC2/wfpc2_top.html . CHAPTER 1: - Introduction . ... 1.2 - Which Instrument to Use: WFPC2, FOC, NICMOS, or STIS? 1.3 - History of WFPC2 . ... 2.7 - Overhead Times . 2.8 - CCD Orientation and Readout . 2.9 - Calibration Channel . CHAPTER 3: - Optical Filters . ... CHAPTER 8: - Calibration and Data Reduction . ...