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          <p class="title">DRAFT DICTIONARY</p>
          <p class="title"><font class="smalltitle"></font>CBF/imgCIF Extensions Dictionary</p>
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          <p class="title">Draft version 1.5 for comment</p>
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<h5>Image dictionary (imgCIF) version 1.5.4</h5>
<h1>_array_structure.compression_type</h1><b>Name:</b><br /><tt class="cifdefinition">'_array_structure.compression_type'</tt> 
<p><b>Definition:</b></p><pre class="cifdefinition">
       Type of data-compression method used to compress the array
              data.

</pre>
<p><b>Type:</b> ucode</p>

<p class="pack"><b>Mandatory item:</b> no</p>

<br /><b>The data value must be one of the following:</b><br /><br />
<table width="100%"><tr class="cifexample"><td width="50%">
<br /><tt>byte_offset</tt>
</td><td width="50%">        Using the 'byte_offset' compression scheme as per A. Hammersley
        and the CBFlib manual, section 3.3.3

</td></tr></table>
<table width="100%"><tr class="cifexample"><td width="50%">
<br /><tt>canonical</tt>
</td><td width="50%">        Using the 'canonical' compression scheme (International Tables
        for Crystallography Volume G, Section 5.6.3.1) and CBFlib
        manual section 3.3.1

</td></tr></table>
<table width="100%"><tr class="cifexample"><td width="50%">
<br /><tt>none</tt>
</td><td width="50%">        Data are stored in normal format as defined by
        _array_structure.encoding_type and
        _array_structure.byte_order.

</td></tr></table>
<table width="100%"><tr class="cifexample"><td width="50%">
<br /><tt>packed</tt>
</td><td width="50%">        Using the 'packed' compression scheme, a CCP4-style packing
        as per J. P. Abrahams pack_c.c and CBFlib manual, section 3.3.2.

</td></tr></table>
<table width="100%"><tr class="cifexample"><td width="50%">
<br /><tt>packed_v2</tt>
</td><td width="50%">        Using the 'packed' compression scheme, version 2, as per
        J. P. Abrahams pack_c.c and CBFlib manual, section 3.3.2.

</td></tr></table>

<br />Enumeration default:  </b>none
<p class="pack"><b>Category:</b> <a href="Carray_structure.html" class="catlink">array_structure</a></p>

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