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<p class="MsoNormal"><span lang="EN-US">Hello everyone,</span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I am a GATE beginner and learning GATE by reading the official document. In the section of
</span>“<span lang="EN-US">Defining a scanner geometry</span>”<span lang="EN-US"> in the
</span>“<span lang="EN-US">Getting started</span>”<span lang="EN-US"> part (<a href="https://opengate.readthedocs.io/en/latest/getting_started.html#step-1-defining-a-scanner-geometry">1. Getting Started
<span lang="EN-US"><span lang="EN-US">— GATE documentation (opengate.readthedocs.io)</span></span></a>), it says that in order to save hits, the volume should be attached to CrystalSD. It gives the following example:</span></p>
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<pre style="mso-margin-top-alt:11.25pt;margin-right:0cm;margin-bottom:11.25pt;margin-left:0cm;line-height:14.35pt;background:#EEEEEE"><span class="c1"><i><span lang="EN-US" style="font-size:11.0pt;font-family:Consolas;color:#8F5902"># D E F I N E A S E N S I T I V E D E T E C T O R</span></i></span><span lang="EN-US" style="font-size:11.0pt;font-family:Consolas;color:#3E4349"><o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:11.25pt;margin-right:0cm;margin-bottom:11.25pt;margin-left:0cm;line-height:14.35pt;background:#EEEEEE"><span class="o"><span lang="EN-US" style="font-size:11.0pt;font-family:Consolas;color:#582800">/</span></span><span class="n"><span lang="EN-US" style="font-size:11.0pt;font-family:Consolas;color:black">gate</span></span><span class="o"><span lang="EN-US" style="font-size:11.0pt;font-family:Consolas;color:#582800">/</span></span><span class="n"><span lang="EN-US" style="font-size:11.0pt;font-family:Consolas;color:black">box2</span></span><span class="o"><span lang="EN-US" style="font-size:11.0pt;font-family:Consolas;color:#582800">/</span></span><span class="n"><span lang="EN-US" style="font-size:11.0pt;font-family:Consolas;color:black">attachCrystalSD</span></span><span lang="EN-US" style="font-size:11.0pt;font-family:Consolas;color:#3E4349"> </span><span class="n"><span lang="EN-US" style="font-size:11.0pt;font-family:Consolas;color:black">vglue</span></span><span lang="EN-US" style="font-size:11.0pt;font-family:Consolas;color:#3E4349"> </span><span class="mi"><span lang="EN-US" style="font-size:11.0pt;font-family:Consolas;color:#990000">1</span></span><span class="n"><span lang="EN-US" style="font-size:11.0pt;font-family:Consolas;color:black">cm</span></span><span lang="EN-US" style="font-size:11.0pt;font-family:Consolas;color:#3E4349"><o:p></o:p></span></pre>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">I am confused with
</span><span style="font-size:12.0pt">“<span lang="EN-US">vglue 1cm</span>”<span lang="EN-US">. What does this mean? I checked with other examples, and found that all of them just used the command
</span>“<span lang="EN-US">attachCrystalSD</span>”<span lang="EN-US"> without any arguments. Can someone help explaine this? Really appreciated.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">Sincerely,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">Mango Feng<o:p></o:p></span></p>
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