from pyx import *

g = graph.graphxy(width=8, x=graph.axis.nestedbar())
g.plot([graph.data.file("minimal.dat", xname="$0, 0", y=2),
        graph.data.file("minimal.dat", xname="$0, 1", y=3)],
       [graph.style.bar()])
g.writeEPSfile("compare")
g.writePDFfile("compare")