This attribute controls the appearance of an annotated coordinate grid (drawn with the AST_GRID routine) by determining whether the descriptive labels drawn for each axis of a Plot should include a description of the units being used on the axis. It takes a separate value for each physical axis of a Plot so that, for instance, the setting " LabelUnits(2)=1" specifies that a unit description should be included in the label for the second axis.

If the LabelUnits value of a Plot axis is non-zero, a unit description will be included in the descriptive label for that axis, otherwise it will be omitted. The default behaviour is to include a unit description unless the current Frame of the Plot is a SkyFrame representing equatorial, ecliptic, galactic or supergalactic coordinates, in which case it is omitted.

Plot

• The text used for the unit description is obtained from the Plot’ s Unit(axis) attribute.

• If no axis is specified, (e.g. " LabelUnits" instead of " LabelUnits(2)" ), then a " set" or " clear" operation will affect the attribute value of all the Plot axes, while a " get" or " test" operation will use just the LabelUnits(1) value.

• If the current Frame of the Plot is not a SkyFrame, but includes axes which were extracted from a SkyFrame, then the default behaviour is to include a unit description only for those axes which were not extracted from a SkyFrame.