[Python] Python Pyx: bar graph y-axis height

I wanna make a bar graph plot in PyX (see here) using the code

from pyx import *
g = graph.graphxy(width=8, x=graph.axis.bar())
g.plot(graph.data.file("minimal.dat", xname=0, y=2), [graph.style.bar()])
g.writePDFfile("minimal")


and the data

1 0.4
2 0.5
3 0.2
4 0.1
5 0.0


I get the plot



Question: how to force the y-axis maximum to be 1.0 instead of 0.5?

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