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Section 3
FITS Fundamentals
3.1 Basic FITS
3.1.1 Primary Header
3.1.1.1 Required Keywords
3.1.1.2 Reserved Keywords
3.1.1.3 Some Hints on Keyword Usage
3.1.1.4Units
3.1.2 Primary Data Array
3.1.2.1 Scaled Integers
3.1.2.2 Undefined Integers
3.1.2.3 IEEE Floating Point Data
3.2 Random Groups
3.2.1 Header
3.2.1.1 Required Keywords
3.2.1.2 Random Parameter Reserved Keywords
3.2.2 Data Records
3.3 Extensions
3.3.1 Required Keywords for an Extension Header
3.3.2 Reserved Keywords for Extension Headers
3.3.3 Creating New Extensions
3.4 ASCII Table Extension
3.4.1 Required Keywords for ASCII Table Extension
3.4.2 Reserved Keywords for ASCII Table Extension
3.4.3 Data Records in an ASCII Table Extension
3.5 The Image Extension
3.5.1 Header
3.5.2 Data Records
3.6 Binary Tables
3.6.1 Required Keywords for Binary Table Extension Headers
3.6.2 Reserved Keywords for Binary Table Extension Header
3.6.3 Binary Table Extension Data Records
3.7 Reading FITS Format
3.8 FITS Files and Physical Media
