Re move all of the "box line"

I'd like to save an image with sole the graph.
I set up

ax.set_xticklabels([])
ax.set_frame_on(False)

but I get an image with tra graph and some lines on the frame level, wich I
wanna remove.
I attach the image to be more understandable (I circle in red what I'd like
to get off).
Suggestions??

Thanks in advance
http://old.nabble.com/file/p33537650/geo.png

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