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<span style="font-size:xx-large"><span style="font-size:150%"><span style="font-weight:bold">CFITSIO User&#X2019;s Reference Guide</span></span></span><br>
</div><p>
<br>
<br>
</p><div class="center">
<span style="font-size:x-large"><span style="font-weight:bold">An Interface to FITS Format Files</span></span><br>
</div><div class="center">
<span style="font-size:x-large"><span style="font-weight:bold">for C Programmers</span></span><br>
</div><p>
<br>
<br>
</p><div class="center">
<span style="font-size:x-large">Version 3.4 <br>
</span>
</div><p>
<br>
<br>
2.5cm
</p><div class="center">
HEASARC<br>
Code 662<br>
Goddard Space Flight Center<br>
Greenbelt, MD 20771<br>
USA
</div><p><br>
<br>
</p><div class="center">
<span style="font-size:x-large">August 2017<br>
</span>
</div><ul>
<li><a href="cfitsio001.html">Contents</a>
</li><li><a href="cfitsio002.html">Introduction </a>
<ul>
<li><a href="cfitsio002.html#sec3">A Brief Overview</a>
</li><li><a href="cfitsio002.html#sec4">Sources of FITS Software and Information</a>
</li><li><a href="cfitsio002.html#sec5">Acknowledgments</a>
</li><li><a href="cfitsio002.html#sec6">Legal Stuff</a>
</li></ul>
</li><li><a href="cfitsio003.html">Creating the CFITSIO Library </a>
<ul>
<li><a href="cfitsio003.html#sec8">Building the Library</a>
</li><li><a href="cfitsio003.html#sec13">Testing the Library</a>
</li><li><a href="cfitsio003.html#sec14">Linking Programs with CFITSIO</a>
</li><li><a href="cfitsio003.html#sec15">Using CFITSIO in Multi-threaded Environments</a>
</li><li><a href="cfitsio003.html#sec16">Getting Started with CFITSIO</a>
</li><li><a href="cfitsio003.html#sec17">Example Program</a>
</li></ul>
</li><li><a href="cfitsio004.html">A FITS Primer </a>
</li><li><a href="cfitsio005.html">Programming Guidelines </a>
<ul>
<li><a href="cfitsio005.html#sec20">CFITSIO Definitions</a>
</li><li><a href="cfitsio005.html#sec21">Current Header Data Unit (CHDU)</a>
</li><li><a href="cfitsio005.html#sec22">Function Names and Variable Datatypes</a>
</li><li><a href="cfitsio005.html#sec23">Support for Unsigned Integers and Signed Bytes</a>
</li><li><a href="cfitsio005.html#sec24">Dealing with Character Strings</a>
</li><li><a href="cfitsio005.html#sec25">Implicit Data Type Conversion</a>
</li><li><a href="cfitsio005.html#sec26">Data Scaling</a>
</li><li><a href="cfitsio005.html#sec27">Support for IEEE Special Values</a>
</li><li><a href="cfitsio005.html#sec28">Error Status Values and the Error Message Stack</a>
</li><li><a href="cfitsio005.html#sec29">Variable-Length Arrays in Binary Tables</a>
</li><li><a href="cfitsio005.html#sec30">Multiple Access to the Same FITS File</a>
</li><li><a href="cfitsio005.html#sec31">When the Final Size of the FITS HDU is Unknown</a>
</li><li><a href="cfitsio005.html#sec32">CFITSIO Size Limitations</a>
</li></ul>
</li><li><a href="cfitsio006.html">Basic CFITSIO Interface Routines </a>
<ul>
<li><a href="cfitsio006.html#sec34">CFITSIO Error Status Routines</a>
</li><li><a href="cfitsio006.html#sec35">FITS File Access Routines</a>
</li><li><a href="cfitsio006.html#sec36">HDU Access Routines</a>
</li><li><a href="cfitsio006.html#sec37">Header Keyword Read/Write Routines</a>
</li><li><a href="cfitsio006.html#sec40">Primary Array or IMAGE Extension I/O Routines</a>
</li><li><a href="cfitsio006.html#sec41">Image Compression</a>
</li><li><a href="cfitsio006.html#sec42">ASCII and Binary Table Routines</a>
</li><li><a href="cfitsio006.html#sec49">Utility Routines</a>
</li></ul>
</li><li><a href="cfitsio007.html">The CFITSIO Iterator Function </a>
<ul>
<li><a href="cfitsio007.html#sec54">The Iterator Work Function</a>
</li><li><a href="cfitsio007.html#sec55">The Iterator Driver Function</a>
</li><li><a href="cfitsio007.html#sec56">Guidelines for Using the Iterator Function</a>
</li><li><a href="cfitsio007.html#sec57">Complete List of Iterator Routines</a>
</li></ul>
</li><li><a href="cfitsio008.html">World Coordinate System Routines </a>
<ul>
<li><a href="cfitsio008.html#sec59">Self-contained WCS Routines</a>
</li></ul>
</li><li><a href="cfitsio009.html">Hierarchical Grouping Routines </a>
<ul>
<li><a href="cfitsio009.html#sec61">Grouping Table Routines</a>
</li><li><a href="cfitsio009.html#sec62">Group Member Routines</a>
</li></ul>
</li><li><a href="cfitsio010.html">Specialized CFITSIO Interface Routines </a>
<ul>
<li><a href="cfitsio010.html#sec64">FITS File Access Routines</a>
</li><li><a href="cfitsio010.html#sec65">HDU Access Routines</a>
</li><li><a href="cfitsio010.html#sec66">Specialized Header Keyword Routines</a>
</li><li><a href="cfitsio010.html#sec74">Define Data Scaling and Undefined Pixel Parameters</a>
</li><li><a href="cfitsio010.html#sec75">Specialized FITS Primary Array or IMAGE Extension I/O Routines</a>
</li><li><a href="cfitsio010.html#sec76">Specialized FITS ASCII and Binary Table Routines</a>
</li></ul>
</li><li><a href="cfitsio011.html">Extended File Name Syntax </a>
<ul>
<li><a href="cfitsio011.html#sec82">Overview</a>
</li><li><a href="cfitsio011.html#sec83">Filetype</a>
</li><li><a href="cfitsio011.html#sec90">Base Filename</a>
</li><li><a href="cfitsio011.html#sec91">Output File Name when Opening an Existing File</a>
</li><li><a href="cfitsio011.html#sec92">Template File Name when Creating a New File</a>
</li><li><a href="cfitsio011.html#sec93">Image Tile-Compression Specification</a>
</li><li><a href="cfitsio011.html#sec94">HDU Location Specification</a>
</li><li><a href="cfitsio011.html#sec95">Image Section</a>
</li><li><a href="cfitsio011.html#sec96">Image Transform Filters</a>
</li><li><a href="cfitsio011.html#sec97">Column and Keyword Filtering Specification</a>
</li><li><a href="cfitsio011.html#sec98">Row Filtering Specification</a>
</li><li><a href="cfitsio011.html#sec105">Binning or Histogramming Specification</a>
</li></ul>
</li><li><a href="cfitsio012.html">Template Files </a>
<ul>
<li><a href="cfitsio012.html#sec107">Detailed Template Line Format</a>
</li><li><a href="cfitsio012.html#sec108">Auto-indexing of Keywords</a>
</li><li><a href="cfitsio012.html#sec109">Template Parser Directives</a>
</li><li><a href="cfitsio012.html#sec110">Formal Template Syntax</a>
</li><li><a href="cfitsio012.html#sec111">Errors</a>
</li><li><a href="cfitsio012.html#sec112">Examples</a>
</li></ul>
</li><li><a href="cfitsio013.html">Local FITS Conventions </a>
<ul>
<li><a href="cfitsio013.html#sec114">64-Bit Long Integers</a>
</li><li><a href="cfitsio013.html#sec115">Long String Keyword Values.</a>
</li><li><a href="cfitsio013.html#sec116">Arrays of Fixed-Length Strings in Binary Tables</a>
</li><li><a href="cfitsio013.html#sec117">Keyword Units Strings</a>
</li><li><a href="cfitsio013.html#sec118">HIERARCH Convention for Extended Keyword Names</a>
</li><li><a href="cfitsio013.html#sec119">Tile-Compressed Image Format</a>
</li></ul>
</li><li><a href="cfitsio014.html">Optimizing Programs </a>
<ul>
<li><a href="cfitsio014.html#sec121">How CFITSIO Manages Data I/O</a>
</li><li><a href="cfitsio014.html#sec122">Optimization Strategies</a>
</li></ul>
</li><li><a href="cfitsio015.html">Index of Routines </a>
</li><li><a href="cfitsio016.html">Parameter Definitions </a>
</li><li><a href="cfitsio017.html">CFITSIO Error Status Codes </a>
</li></ul>
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