definitions.xml

  <define>
    <constant name="IPBeampipe_rmax" value="2.5*25.4*mm/2.0"/>
    <constant name="Beampipe_rmax"   value="IPBeampipe_rmax"/>
    <constant name="BeampipeOD"      value="2.0*IPBeampipe_rmax"/>    
    <constant name="tracker_region_zmax"      value="2.0*mm"/>
    <constant name="tracker_region_rmax"      value="2.0*mm"/>
  </define>