matplotlib.pyplot.twiny
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matplotlib.pyplot.twiny(ax=None)
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Make a second axes that shares the y-axis. The new axis will overlay ax (or the current axes if ax is None). The ticks for ax2 will be placed on the top, and the ax2 instance is returned.
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http://matplotlib.org/2.1.0/api/_as_gen/matplotlib.pyplot.twiny.html