The points which are labelled may be selected by an arbitrary logical expression from those in the input dataset. The arguments may be listed within parentheses in any order, separated by commas. The offset may be specified as a numeric constant or as the name of a variable in the data set. Positive values move the label to the right relative to the point.
Positive values move the label upwards relative to the point.
The name of the font used for the label. A point will be labelled if the expression evaluates to non-zero for the current observation.