Do the right and top spines display correctly when the position is set using 'axes' coordinates?

import matplotlib.pyplot as plt

import numpy as np

fig = plt.figure()

x = np.linspace(0,2*np.pi,100)

y = 2*np.sin(x)

ax = fig.add_subplot(1,1,1)

ax.set_title('centered spines')

ax.plot(x,y)

ax.spines['right'].set_position(('axes',0.1))

ax.yaxis.set_ticks_position('right')

ax.spines['top'].set_position(('axes',0.25))

ax.xaxis.set_ticks_position('top')

ax.spines['left'].set_color('none')

ax.spines['bottom'].set_color('none')

fig.savefig('test.png',bbox_inches='tight')

Notice that the top spine is 0.25 in axes coordinates, where 0 in the axes coordinates is the *top* of the picture, and positive goes up. I'd expect that 0.25 in axes coordinates be 25% from the bottom of the picture, or that the coordinates would be reversed for the top spine and the top spine would be positioned 25% from the top of the picture. Having it jump above the picture was a surprise. I noticed the same sort of issue for the right spine, as illustrated above as well.

Of course, it may be that I'm just not understanding something...

Thanks,

Jason

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Jason Grout