are there some relative/absolute limits in the plotting area?
I would like to set some text (labels) in the plot automatically, so
that I do not need to recalculate everytime where they should go.
I mean some kind of absolute X0, Y0, X1, Y1 , so that I know where to
place the labels in text in the plot area without having to look at
the particular values of the particular plot I am dealing with, in a
series of very similar plots.