The following is an example of how to set marker lines in your program. This example assumes that GDataY contains values in data sets 1, 2, and 3 only. A marker is placed at the plotted data points that are defined by Y values of 75 and 100.

copy "75" to GDataY[4,1]    # Copies marker values copy "100" to GDataY[4,2]   # into next highest

                            # data set.

copy true to GYMarkers[1]   # Enables marker for

                            # element 1.

copy true to GYMarkers[2]   # Enables marker for

                            # element 2.

copy true to GMarkerLines   # Enables drawing.