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<!--#set var="TITLE" value="GRD Plugin, Version 0.6"-->
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<p>This plugin reads binary potential maps in the format used by <a
  href="http://trantor.bioc.columbia.edu/delphi/">DelPhi</a> and <a
  href="http://honiglab.cpmc.columbia.edu/grasp/">Grasp</a>. More
information on this format can be found at <a
  href="http://honiglab.cpmc.columbia.edu/grasp/grasp_contents.html#A.2">http://honiglab.cpmc.columbia.edu/grasp/grasp_contents.html#A.2</a>
and <a
  href="http://trantor.bioc.columbia.edu/delphi/doc/file_format.html">http://trantor.bioc.columbia.edu/delphi/doc/file_format.html</a>.

To read the "formatted ASCII" files created by <a
  href="http://www.msg.ucsf.edu/local/programs/insightII/doc/life/insight2000.1/delphi/B_Utilities.html#696658">format_phi</a>,
use the <a href="phiplugin.html">phiplugin</a>.

<h3>Notes:</h3>

<p><b>Read-only</b>
<br>This plugin is used only to read files. VMD does not currently support
writing this file type.</p>

<p><b>Grid Points</b>
<br>It is assumed that the density values of all files are arranged in a
cubic grid. This plugin is not limited to 65x65x65 grid points as earlier
versions of the file format are.</p>

<p><b>Unit Cell</b>
<br>Since PHI maps do not explicitly state the angles of the basis vectors,
it is assumed that they are orthogonal.</p>

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