default axes rect

Anyone know how the default axes rectangle is set? The default width and height are apparently not the same

>>> from pylab import *
>>> ax=axes()
>>> ax.get_position()
[0.125, 0.099999999999999978, 0.77500000000000002, 0.80000000000000004]

I'd like the last two numbers to be identical (say 0.8), that way I can be sure that a plot will have a certain aspect ratio if the figure dimensions have that aspect ratio.



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