C C Define the data arrays. C C Define the graph-window parameter array. C C Fill the data arrays. C C Do four graphs on the same frame, using different C backgrounds. C C Position the graph window.
C C Declare the background type.
C C Setting the background type may have turned informational C labels off. In that case, turn them back on. C C Set up the label for the top of the graph. C C Draw a boundary around the edge of the plotter frame.