This example shows to how to make routine trend data interactive by allowing
User to select which data series to show, the time span to show (zoom effect)
and to scroll through data with a scroll bar.
The workbook includes weekly algal test results (3 species and
total count) and algal control treatments for Wachusett Reservoir
the period 1989 - 2000. User can select which specie to view, the
time span for the chart and scroll through the data period.