Chapter 4: IRAF Primer 4.1 IRAF Overview 4.2 Initiating IRAF 4.2.1 Setting Up IRAF in Unix/Linux 4.2.2 Starting and Stopping an IRAF Session 4.3 IRAF Basics 4.3.1 Loading Packages 4.3.2 Running Tasks 4.3.3 Getting Help 4.3.4 Setting Parameters 4.3.5 Setting Environment Variables 4.3.6 File Management 4.3.7 Troubleshooting 4.4 PyRAF Capabilities 4.5 Accessing IRAF, PyRAF, and STSDAS Software 4.5.1 Accessing the Synphot Data Set