Plot a diode I/V characteristic

[anger]

Hi!

I'm trying to plot a I(V) curve of a diode.
The problem is that the scale of V below 0 is much smaller than the scale
above 0 (the picture illustrate it) 
https://i.ytimg.com/vi/_vKeaPHXF9U/maxresdefault.jpg
Can I split the scales above and below zero?
I'm using Octave 4.2.2 on Lubuntu.

Thanks,
anger



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