BEGIN GPL
SOURCE: s = userSource(id("graphdataset"))
DATA: Diff=col(source(s), name("Diff"))
DATA: Read=col(source(s),name("Read"))
GUIDE: axis(dim(1), label("Change from 2007-8"))
GUIDE: axis(dim(2), label("Scale Score"))
ELEMENT: point(position(Diff*Read))
END GPL.