I try to make char with difrent scale on y axis above and under 0. I manage to do something with “secondary Y axis” option like this. But position of this axis is wrong. Can anyone help?
For first y-axis set the start to -2, end to 8, for the second y-axis set start to -0.12 and end to 0.12/2*8 = 0.48.
Now you could cover useless parts of axis with a white rectangle or even draw an axis look-alike on the left from lines and text boxes.
This is as close you can get with LibO. If this is not enough, use Gnumeric or some scriptable plotting system such as gnuplot.