reflection {<xray-reflection-statement>} end

<xray-reflection-statement> :==

  nreflection=<integer>
  --{Number of reflections: must be specified before any reflection.}
  reset
  --{Remove existing reflections.}
  declare <xray-declare-statement> end
  --{Declare crystallographic objects.}
  group <xray-group-statement> end
  --{Group crystallographic objects.}
  anomalous=<logical>
  --{Non-anomalous / anomalous data.}
  index <integer> <integer> <integer> {<real><real>|<real>|<integer>}
  --{A reflection: h k l [complex-object] [real-object] [integer-object]
     A complex object consists of 2 real numbers: an amplitude and a phase.}

  --{The index statements must be read after object declarations. 
     To merge two data sets or to merge different information the two
     reflection sets should be read with individual xray reflection
     statements, i.e.
       xray reflection @<filename> end  reflection @<filename> end
     The command line echo is automatically turned off for the index
     statements (except for the first occurrence).}