anchor.diff:  the show variable was stored) or <<oscillated-parameters,oscillated
   parameters>>.
   
  -## Pan Tilt Parameters
  +== Pan Tilt Parameters
   
   A more traditional way of aiming fixtures (in contrast to
   <<parameters#direction-parameters,Direction Parameters>>) involves
  
positive.code: parameters, as shown in the
  <<effects#spatial-effects,effect examples>>.
  
  ## Digging Deeper
  
  For more details, see the
  http://deepsymmetry.org/afterglow/doc/afterglow.effects.params.html[API
  
negative.code: the show variable was stored) or <<oscillated-parameters,oscillated
  parameters>>.
  
  == Aim Parameters
  
  Aim parameters are a way to tell a group of fixtures to aim at a
  particular point in space, or track something in unison or in a
  