Cubic aspect ratio

[pathematica]

I would be grateful if I might check something. 

In the current version of Octave, by experimentation I can obtain a cubic
aspect ratio in a plot3 using 

set (gca (), "dataaspectratio", [1 1 2/3]);


In previous versions (including the one that is in the Ubuntu repositories)
it was necessary to use

set (gca (), "position", [0.13000   -0.05000   0.77500   1.08000]);


I would be grateful if someone would confirm the value in the z axis (2/3).
I have found it by experimentation, judging by eye.

Thanks

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