NAME
     DefPropSpec - define spectrum property
     DefPropPeak  - define peak property
     DefPropPrim  - define primitive property

SYNOPSIS
     DefPropSpec propertyName expr
     DefPropPeak propertyName expr
     DefPropPrim propertyName expr

DESCRIPTION
     Define a property with the given name by the given
     expression. See SelectSpec for a description of the
     expression syntax. Properties can be used in other
     property definitions or selections. The Select
     commands are actually just special cases of the
     DefProp commands, they defines the property with
     the name "selected". The following properties are
     used internally by the program and should not be
     defined by this command:

	 all
	 visible

     The value of the "visible" property is maintained
     by the program, it is set for all spectra, peaks
     and primitives that have their attributes (Style*)
     set in a way to make them visible. This is very
     convenient for selecting only visible items.

     The "displayed" property is used by the program to
     decide which items should be displayed. It is not
     recommended to modify it, it is normally better to
     use the Style* commands for changing the visibility.
     It is very useful for spectra, however, but the
     DialSpec command is more convenient for modifying
     it in this case.

     The "movable" property is used by the program to
     decide which items are moved by rotations etc.
     It only has an influence for spectra, and the
     DialSpec command is more convenient for modifying it.

     Some properties are predefined, they can be seen
     in the file:

	 $MOLMOLHOME/setup/PropDef

     or with the HelpProp command.

EXAMPLES
     DefPropPeak 'good' 'qual > 0.4'

SEE ALSO
     DialSelect, SelectSpec, ..., DialSpec, HelpProp

DATE
     960912
