Hi I am trying to make a chart of patients lab vaules...basically for each
patient I have there date and corresponding lab value making this line graph
is easy....what I want to do is a vertical line at a particular date that
corresponds to a treatment date...this date more than likely has no lab value
that corresponds to it.... I think I could do individually by just drawing a
marker in on the existing line graph ...but with multiple people and multiple
treatment dates for each patient this could become lengthy ...is there some
trick I am missing?