Syntax:  SET LANGUAGE OVERVIEW TAB RANGE min_value max_value
              defined_language

  Indicates the range of tab values for which the adjustment
  definitions are valid.

  The default is (4,8).  The second value must be at least twice the
  first value; both values must be positive.  For example, if the tab
  range is (4,8), then LSE assumes that the adjustment definitions will
  work for any SET LANGUAGE TAB value from 4 to 8 inclusive.  If you
  specify a tab increment value outside the tab range, then LSE
  recomputes indentation to make the adjustments work.

  For best performance, it is recommended that you avoid recomputation
  by choosing a range that covers reasonable values.  The numbers
  specified for the SET ADJUSTMENT CURRENT and NEW GRAMMAR commands
  must work for any tab increment value in the tab range.