Annotation Plotting Group Variable Use this field to specify a variable (such as Chromosome ) by which to group the results. A separate plot is created for each distinct value of this variable. To Specify an Annotation Plotting Group Variable: Specify the Annotation SAS Data Set . All of the variables in the specified annotation data set are displayed in the Available Variables field. Examine the list of available variables. Highlight the variables to group the results for plotting. Click to add the highlighted variable(s) to the Annotation Plotting Group (Chromosome e.g.) Variable field, as shown below: