search cluster {<xray-search-cluster-statement>} end

<xray-search-cluster-statement> :==

  peak <real> <real> <real> <real>
  --{Define angle1 angle2 angle3 rotation-function.}
  cluster=<logical>
  --{Perform cluster analysis. Default=false}
  mode=euler|lattman|spherical
  --{Definition of angles in peak entry. Default=euler}
  list=<filename>
  --{File for list of highest peaks.}
  nlist=<integer>
  --{Specifies the number of highest peaks of the rotation function that
     will be listed.}
  epsilon=<real>
  --{Epsilon for cluster analysis. This defines a matrix norm to
     determine whether two rotation matrices are close. The default
     value is reasonable for 10 degree grids.}
  symbol=<string>
  --{Root name for the symbol table. If blank to table is created (this is
     the default.}
  symmetry=?|reset|<symmetry-operator>
  --{Define symmetry operators which are required for proper grouping of
     symmetry related peaks during cluster analysis.}
  ?
  --{Prints current parameters and options.}

  --{The following symbols are created upon completion:
       $<symbolname>_nlist - number of peaks
       $<symbolname>_rfvalue_<i> - rotation function value
       $<symbolname>_theta1_<i> - for Eulerian and Lattman mode
       $<symbolname>_theta2_<i> - for Eulerian and Lattman mode
       $<symbolname>_theta3_<i> - for Eulerian and Lattman mode
       $<symbolname>_phi_<i> - for spherical polar angle mode
       $<symbolname>_psi_<i> - for spherical polar angle mode
       $<symbolname>_kappa_<i> - for spherical polar angle mode
     where <i> runs through the clustered peak list.}