Problem with interactive zooming in figure object


I have a problem with the interactive zooming function of the matplotlib
"figure" Object.
I plotted a set of data as a line (simulated data) and a set of data
(measured data) as points. They are both in a subplot to show the
    plot (X1, Y1, color=(r1,g1,b1),linewidth=1.0)
    plot (X2, Y2, 'ro',markersize=2)

Zooming is only possible in parts of the graph, where there is only the data
(X1, Y1) printed.

Does someone can help me?

Thanks in advance.



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