See "Displaying Multiple Sets of Control Limits". The VREF=, VREFLABELS=, and VREFLABPOS= options are used to display and label the trial limits. You can also pass in the values of the trial limits ...

These variables are assigned to the corresponding Annotate variable. See The GCHART Procedure for more information on creating bar charts. libname reflib ' SAS-data-library '; goptions reset=global ...