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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>WCSLIB 4.8.2: fitskey Struct Reference</title>
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<div class="contents">
<h1>fitskey Struct Reference</h1><!-- doxytag: class="fitskey" -->Keyword/value information.
<a href="#_details">More...</a>
<p>
<code>#include <<a class="el" href="fitshdr_8h-source.html">fitshdr.h</a>></code>
<p>
<table border="0" cellpadding="0" cellspacing="0">
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<tr><td colspan="2"><br><h2>Data Fields</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structfitskey.html#43de42050c7e0232c9f7c5a28bfede4b">keyno</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structfitskey.html#f5bd77eb6d318c562bfe650f6784eb5f">keyid</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structfitskey.html#935a63ff3aa2c0403ed8eee1a94662e7">status</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char </td><td class="memItemRight" valign="bottom"><a class="el" href="structfitskey.html#48b4ff24100b6ada4fd184d5c3d55eec">keyword</a> [12]</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structfitskey.html#dbc83643fe92fd44408a6d62dbaf87b1">type</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structfitskey.html#42413fd1f1f3117a4bc4c0599c2c3889">padding</a></td></tr>
<tr><td class="memItemLeft" nowrap>union {</td></tr>
<tr><td class="memItemLeft" nowrap> int <a class="el" href="structfitskey.html#88e62afbb23808ae484b8734bb1685b9">i</a></td></tr>
<tr><td class="memItemLeft" nowrap> <a class="el" href="fitshdr_8h.html#88ab82d73e5c2607f0a40af8917fffe1">int64</a> <a class="el" href="structfitskey.html#f1a8fb88bc5d4ba60f9f12d0885c360e">k</a></td></tr>
<tr><td class="memItemLeft" nowrap> int <a class="el" href="structfitskey.html#68ab074cc13a9e0be1583ee93aa0db6b">l</a> [8]</td></tr>
<tr><td class="memItemLeft" nowrap> double <a class="el" href="structfitskey.html#e6f81da89b09d92db5258191a1a9354b">f</a></td></tr>
<tr><td class="memItemLeft" nowrap> double <a class="el" href="structfitskey.html#413484cd565be07b4adc75ed53c4ace7">c</a> [2]</td></tr>
<tr><td class="memItemLeft" nowrap> char <a class="el" href="structfitskey.html#aa0b63820fb73086d2f55ea9687d8126">s</a> [72]</td></tr>
<tr><td class="memItemLeft" nowrap valign="top">} </td><td class="memItemRight" valign="bottom"><a class="el" href="structfitskey.html#a914a7430a2746de8ceb641321842784">keyvalue</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structfitskey.html#d50ff3c9166c43e1fe0542b18a216ee1">ulen</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char </td><td class="memItemRight" valign="bottom"><a class="el" href="structfitskey.html#4fe936ed7df47a073c049f4fe1528ba2">comment</a> [84]</td></tr>
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<hr><a name="_details"></a><h2>Detailed Description</h2>
<a class="el" href="fitshdr_8h.html#ebb4607327b6db35b468517328f67878" title="FITS header parser routine.">fitshdr()</a> returns an array of <b>fitskey</b> structs, each of which contains the result of parsing one FITS header keyrecord. All members of the <b>fitskey</b> struct are returned by <a class="el" href="fitshdr_8h.html#ebb4607327b6db35b468517328f67878" title="FITS header parser routine.">fitshdr()</a>, none are given by the user. <hr><h2>Field Documentation</h2>
<a class="anchor" name="43de42050c7e0232c9f7c5a28bfede4b"></a><!-- doxytag: member="fitskey::keyno" ref="43de42050c7e0232c9f7c5a28bfede4b" args="" -->
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<td class="memname">int <a class="el" href="structfitskey.html#43de42050c7e0232c9f7c5a28bfede4b">fitskey::keyno</a> </td>
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(<em>Returned</em>) Keyrecord number (1-relative) in the array passed as input to <a class="el" href="fitshdr_8h.html#ebb4607327b6db35b468517328f67878" title="FITS header parser routine.">fitshdr()</a>. This will be negated if the keyword matched any specified in the keyids[] index.
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<a class="anchor" name="f5bd77eb6d318c562bfe650f6784eb5f"></a><!-- doxytag: member="fitskey::keyid" ref="f5bd77eb6d318c562bfe650f6784eb5f" args="" -->
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<td class="memname">int <a class="el" href="structfitskey.html#f5bd77eb6d318c562bfe650f6784eb5f">fitskey::keyid</a> </td>
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(<em>Returned</em>) Index into the first entry in keyids[] with which the keyrecord matches, else -1.
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<a class="anchor" name="935a63ff3aa2c0403ed8eee1a94662e7"></a><!-- doxytag: member="fitskey::status" ref="935a63ff3aa2c0403ed8eee1a94662e7" args="" -->
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<td class="memname">int <a class="el" href="structfitskey.html#935a63ff3aa2c0403ed8eee1a94662e7">fitskey::status</a> </td>
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<p>
(<em>Returned</em>) Status flag bit-vector for the header keyrecord employing the following bit masks defined as preprocessor macros:<p>
<ul>
<li>
FITSHDR_KEYWORD: Illegal keyword syntax. </li>
<li>
FITSHDR_KEYVALUE: Illegal keyvalue syntax. </li>
<li>
FITSHDR_COMMENT: Illegal keycomment syntax. </li>
<li>
FITSHDR_KEYREC: Illegal keyrecord, e.g. an <code><b><code><b>END</b></code></b></code> keyrecord with trailing text. </li>
<li>
FITSHDR_TRAILER: Keyrecord following a valid <code><b><code><b>END</b></code></b></code> keyrecord. </li>
</ul>
<p>
The header keyrecord is syntactically correct if no bits are set.
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<a class="anchor" name="48b4ff24100b6ada4fd184d5c3d55eec"></a><!-- doxytag: member="fitskey::keyword" ref="48b4ff24100b6ada4fd184d5c3d55eec" args="[12]" -->
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<td class="memname">char <a class="el" href="structfitskey.html#48b4ff24100b6ada4fd184d5c3d55eec">fitskey::keyword</a> </td>
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(<em>Returned</em>) Keyword name, null-filled for keywords of less than eight characters (trailing blanks replaced by nulls).<p>
Use <div class="fragment"><pre class="fragment"> sprintf(dst, <span class="stringliteral">"%.8s"</span>, <a class="code" href="structfitskey.html#48b4ff24100b6ada4fd184d5c3d55eec">keyword</a>)
</pre></div><p>
to copy it to a character array with null-termination, or <div class="fragment"><pre class="fragment"> sprintf(dst, <span class="stringliteral">"%8.8s"</span>, <a class="code" href="structfitskey.html#48b4ff24100b6ada4fd184d5c3d55eec">keyword</a>)
</pre></div><p>
to blank-fill to eight characters followed by null-termination.
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<a class="anchor" name="dbc83643fe92fd44408a6d62dbaf87b1"></a><!-- doxytag: member="fitskey::type" ref="dbc83643fe92fd44408a6d62dbaf87b1" args="" -->
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<td class="memname">int <a class="el" href="structfitskey.html#dbc83643fe92fd44408a6d62dbaf87b1">fitskey::type</a> </td>
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(<em>Returned</em>) Keyvalue data type: <ul>
<li>
0: No keyvalue. </li>
<li>
1: Logical, represented as int. </li>
<li>
2: 32-bit signed integer. </li>
<li>
3: 64-bit signed integer (see below). </li>
<li>
4: Very long integer (see below). </li>
<li>
5: Floating point (stored as double). </li>
<li>
6: Integer complex (stored as double[2]). </li>
<li>
7: Floating point complex (stored as double[2]). </li>
<li>
8: String. </li>
<li>
8+10*n: Continued string (described below and in <a class="el" href="fitshdr_8h.html#ebb4607327b6db35b468517328f67878" title="FITS header parser routine.">fitshdr()</a> note 2). </li>
</ul>
<p>
A negative type indicates that a syntax error was encountered when attempting to parse a keyvalue of the particular type.<p>
Comments on particular data types: <ul>
<li>
64-bit signed integers lie in the range <div class="fragment"><pre class="fragment"> (-9223372036854775808 <= <a class="code" href="fitshdr_8h.html#88ab82d73e5c2607f0a40af8917fffe1" title="64-bit signed integer data type.">int64</a> < -2147483648) ||
(+2147483647 < <a class="code" href="fitshdr_8h.html#88ab82d73e5c2607f0a40af8917fffe1" title="64-bit signed integer data type.">int64</a> <= +9223372036854775807)
</pre></div><p>
A native 64-bit data type may be defined via preprocessor macro WCSLIB_INT64 defined in wcsconfig.h, e.g. as 'long long int'; this will be typedef'd to 'int64' here. If WCSLIB_INT64 is not set, then int64 is typedef'd to int[3] instead and <a class="el" href="structfitskey.html#a914a7430a2746de8ceb641321842784">fitskey::keyvalue</a> is to be computed as <div class="fragment"><pre class="fragment"> ((<a class="code" href="structfitskey.html#a914a7430a2746de8ceb641321842784">keyvalue</a>.k[2]) * 1000000000 +
<a class="code" href="structfitskey.html#a914a7430a2746de8ceb641321842784">keyvalue</a>.k[1]) * 1000000000 +
<a class="code" href="structfitskey.html#a914a7430a2746de8ceb641321842784">keyvalue</a>.k[0]
</pre></div><p>
and may reported via <div class="fragment"><pre class="fragment"> <span class="keywordflow">if</span> (<a class="code" href="structfitskey.html#a914a7430a2746de8ceb641321842784">keyvalue</a>.k[2]) {
printf(<span class="stringliteral">"%d%09d%09d"</span>, <a class="code" href="structfitskey.html#a914a7430a2746de8ceb641321842784">keyvalue</a>.k[2], abs(<a class="code" href="structfitskey.html#a914a7430a2746de8ceb641321842784">keyvalue</a>.k[1]),
abs(<a class="code" href="structfitskey.html#a914a7430a2746de8ceb641321842784">keyvalue</a>.k[0]));
} <span class="keywordflow">else</span> {
printf(<span class="stringliteral">"%d%09d"</span>, <a class="code" href="structfitskey.html#a914a7430a2746de8ceb641321842784">keyvalue</a>.k[1], abs(<a class="code" href="structfitskey.html#a914a7430a2746de8ceb641321842784">keyvalue</a>.k[0]));
}
</pre></div><p>
where keyvalue.k[0] and keyvalue.k[1] range from -999999999 to +999999999.<p>
</li>
<li>
Very long integers, up to 70 decimal digits in length, are encoded in keyvalue.l as an array of int[8], each of which stores 9 decimal digits. <a class="el" href="structfitskey.html#a914a7430a2746de8ceb641321842784">fitskey::keyvalue</a> is to be computed as <div class="fragment"><pre class="fragment"> (((((((<a class="code" href="structfitskey.html#a914a7430a2746de8ceb641321842784">keyvalue</a>.l[7]) * 1000000000 +
<a class="code" href="structfitskey.html#a914a7430a2746de8ceb641321842784">keyvalue</a>.l[6]) * 1000000000 +
<a class="code" href="structfitskey.html#a914a7430a2746de8ceb641321842784">keyvalue</a>.l[5]) * 1000000000 +
<a class="code" href="structfitskey.html#a914a7430a2746de8ceb641321842784">keyvalue</a>.l[4]) * 1000000000 +
<a class="code" href="structfitskey.html#a914a7430a2746de8ceb641321842784">keyvalue</a>.l[3]) * 1000000000 +
<a class="code" href="structfitskey.html#a914a7430a2746de8ceb641321842784">keyvalue</a>.l[2]) * 1000000000 +
<a class="code" href="structfitskey.html#a914a7430a2746de8ceb641321842784">keyvalue</a>.l[1]) * 1000000000 +
<a class="code" href="structfitskey.html#a914a7430a2746de8ceb641321842784">keyvalue</a>.l[0]
</pre></div><p>
</li>
<li>
Continued strings are not reconstructed, they remain split over successive <b>fitskey</b> structs in the keys[] array returned by <a class="el" href="fitshdr_8h.html#ebb4607327b6db35b468517328f67878" title="FITS header parser routine.">fitshdr()</a>. <a class="el" href="structfitskey.html#a914a7430a2746de8ceb641321842784">fitskey::keyvalue</a> data type, 8 + 10n, indicates the segment number, n, in the continuation. </li>
</ul>
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<a class="anchor" name="42413fd1f1f3117a4bc4c0599c2c3889"></a><!-- doxytag: member="fitskey::padding" ref="42413fd1f1f3117a4bc4c0599c2c3889" args="" -->
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(An unused variable inserted for alignment purposes only.)
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<a class="anchor" name="88e62afbb23808ae484b8734bb1685b9"></a><!-- doxytag: member="fitskey::i" ref="88e62afbb23808ae484b8734bb1685b9" args="" -->
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(<em>Returned</em>) Logical (<a class="el" href="structfitskey.html#dbc83643fe92fd44408a6d62dbaf87b1">fitskey::type</a> == 1) and 32-bit signed integer (<a class="el" href="structfitskey.html#dbc83643fe92fd44408a6d62dbaf87b1">fitskey::type</a> == 2) data types in the <a class="el" href="structfitskey.html#a914a7430a2746de8ceb641321842784">fitskey::keyvalue</a> union.
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<a class="anchor" name="f1a8fb88bc5d4ba60f9f12d0885c360e"></a><!-- doxytag: member="fitskey::k" ref="f1a8fb88bc5d4ba60f9f12d0885c360e" args="" -->
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<td class="memname"><a class="el" href="fitshdr_8h.html#88ab82d73e5c2607f0a40af8917fffe1">int64</a> <a class="el" href="structfitskey.html#f1a8fb88bc5d4ba60f9f12d0885c360e">fitskey::k</a> </td>
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(<em>Returned</em>) 64-bit signed integer (<a class="el" href="structfitskey.html#dbc83643fe92fd44408a6d62dbaf87b1">fitskey::type</a> == 3) data type in the <a class="el" href="structfitskey.html#a914a7430a2746de8ceb641321842784">fitskey::keyvalue</a> union.
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<a class="anchor" name="68ab074cc13a9e0be1583ee93aa0db6b"></a><!-- doxytag: member="fitskey::l" ref="68ab074cc13a9e0be1583ee93aa0db6b" args="[8]" -->
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(<em>Returned</em>) Very long integer (<a class="el" href="structfitskey.html#dbc83643fe92fd44408a6d62dbaf87b1">fitskey::type</a> == 4) data type in the <a class="el" href="structfitskey.html#a914a7430a2746de8ceb641321842784">fitskey::keyvalue</a> union.
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<a class="anchor" name="e6f81da89b09d92db5258191a1a9354b"></a><!-- doxytag: member="fitskey::f" ref="e6f81da89b09d92db5258191a1a9354b" args="" -->
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(<em>Returned</em>) Floating point (<a class="el" href="structfitskey.html#dbc83643fe92fd44408a6d62dbaf87b1">fitskey::type</a> == 5) data type in the <a class="el" href="structfitskey.html#a914a7430a2746de8ceb641321842784">fitskey::keyvalue</a> union.
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<a class="anchor" name="413484cd565be07b4adc75ed53c4ace7"></a><!-- doxytag: member="fitskey::c" ref="413484cd565be07b4adc75ed53c4ace7" args="[2]" -->
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(<em>Returned</em>) Integer and floating point complex (<a class="el" href="structfitskey.html#dbc83643fe92fd44408a6d62dbaf87b1">fitskey::type</a> == 6 || 7) data types in the <a class="el" href="structfitskey.html#a914a7430a2746de8ceb641321842784">fitskey::keyvalue</a> union.
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<a class="anchor" name="aa0b63820fb73086d2f55ea9687d8126"></a><!-- doxytag: member="fitskey::s" ref="aa0b63820fb73086d2f55ea9687d8126" args="[72]" -->
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<td class="memname">char <a class="el" href="structfitskey.html#aa0b63820fb73086d2f55ea9687d8126">fitskey::s</a> </td>
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(<em>Returned</em>) Null-terminated string (<a class="el" href="structfitskey.html#dbc83643fe92fd44408a6d62dbaf87b1">fitskey::type</a> == 8) data type in the <a class="el" href="structfitskey.html#a914a7430a2746de8ceb641321842784">fitskey::keyvalue</a> union.
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<a class="anchor" name="a914a7430a2746de8ceb641321842784"></a><!-- doxytag: member="fitskey::keyvalue" ref="a914a7430a2746de8ceb641321842784" args="" -->
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<td class="memname">union <a class="el" href="structfitskey.html#a914a7430a2746de8ceb641321842784">fitskey::keyvalue</a> </td>
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(<em>Returned</em>) A union comprised of<p>
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<a class="el" href="structfitskey.html#88e62afbb23808ae484b8734bb1685b9">fitskey::i</a>, </li>
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<a class="el" href="structfitskey.html#f1a8fb88bc5d4ba60f9f12d0885c360e">fitskey::k</a>, </li>
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<a class="el" href="structfitskey.html#68ab074cc13a9e0be1583ee93aa0db6b">fitskey::l</a>, </li>
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<a class="el" href="structfitskey.html#e6f81da89b09d92db5258191a1a9354b">fitskey::f</a>, </li>
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<a class="el" href="structfitskey.html#413484cd565be07b4adc75ed53c4ace7">fitskey::c</a>, </li>
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<a class="el" href="structfitskey.html#aa0b63820fb73086d2f55ea9687d8126">fitskey::s</a>, </li>
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used by the <b>fitskey</b> struct to contain the value associated with a keyword.
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<a class="anchor" name="d50ff3c9166c43e1fe0542b18a216ee1"></a><!-- doxytag: member="fitskey::ulen" ref="d50ff3c9166c43e1fe0542b18a216ee1" args="" -->
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<td class="memname">int <a class="el" href="structfitskey.html#d50ff3c9166c43e1fe0542b18a216ee1">fitskey::ulen</a> </td>
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(<em>Returned</em>) Where a keycomment contains a units string in the standard form, e.g. [m/s], the ulen member indicates its length, inclusive of square brackets. Otherwise ulen is zero.
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<a class="anchor" name="4fe936ed7df47a073c049f4fe1528ba2"></a><!-- doxytag: member="fitskey::comment" ref="4fe936ed7df47a073c049f4fe1528ba2" args="[84]" -->
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<td class="memname">char <a class="el" href="structfitskey.html#4fe936ed7df47a073c049f4fe1528ba2">fitskey::comment</a> </td>
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(<em>Returned</em>) Keycomment, i.e. comment associated with the keyword or, for keyrecords rejected because of syntax errors, the compete keyrecord itself with null-termination.<p>
Comments are null-terminated with trailing spaces removed. Leading spaces are also removed from keycomments (i.e. those immediately following the '<code><b>/</b></code>' character), but not from <code><b>COMMENT</b></code> or <code><b>HISTORY</b></code> keyrecords or keyrecords without a value indicator (''<code><b>= </b></code>'' in columns 9-80).
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