<?xml version='1.0' encoding='ISO-8859-1'  ?>
<!DOCTYPE index
  PUBLIC "-//Sun Microsystems Inc.//DTD JavaHelp Index Version 1.0//EN"
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<index version="1.0">
   <indexitem text="field of view" target="fov"/>
   <indexitem text="mask"          target="mask"/>
   <indexitem text="slit"          target="slit"/>
</index>