anchor.diff:  |Key
   |Purpose
   
  -|:name
  -
  -|A string which identifies the manufacturer and model of fixture.
  -
   |:channels
   
   | A list of channel specifications which tell Afterglow about the DMX
  
positive.code: |The offset along the fixture Z axis, in meters, from the geometric
   center of the fixture (the point at which Afterglow is told the
   fixture is located when patching the fixture) and the geometric
   center of this head. If this head is centered within the fixture X
   axis, you can omit this value or you can supply it with a value of
   0.0. The <<show_space#show-space,Show Space>> page illustrates the
   axes and links to a function you can use for converting inches to
  
negative.code: |The offset along the fixture X axis, in meters, from the geometric
   center of the fixture (the point at which Afterglow is told the
   fixture is located when patching the fixture) and the geometric
   center of this head. If this head is centered along the fixture X
   axis, you can omit this value or you can supply it with a value of
   0.0. The <<show_space#show-space,Show Space>> page illustrates the
   axes and links to a function you can use for converting inches to
  