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4.1 CFITSIO Definitions
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3. A FITS Primer
4. Programming Guidelines
4.1 CFITSIO Definitions
4.2 Current Header Data Unit (CHDU)
4.3 Function Names and Variable Datatypes
4.4 Support for Unsigned Integers
4.5 Dealing with Character Strings
4.6 Implicit Data Type Conversion
4.7 Data Scaling
4.8 Support for IEEE Special Values
4.9 Error Status Values and the Error Message Stack
4.10 Variable-Length Arrays in Binary Tables
4.11 Multiple Access to the Same FITS File
4.12 When the Final Size of the FITS HDU is Unknown
4.13 CFITSIO Size Limitations