<head>
<title>MARKER</title>
<!-- Changed by: Chris ISELIN, 27-Jan-1997 -->
<!-- Changed by: Hans Grote, 10-Jun-2002 -->
</head>

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<center>
EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH
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<h2>Marker.</h2>
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<pre>
label: MARKER;
</pre>
The simplest element which can occur in a beam line is the MARKER.
It has no effect on the beam,
but it allows one to identify a position in the beam line,
for example to apply a matching