I have to make charts according an ISO-qualification. The Y-axis has to go
from bottom to top with a difference of 50, for instance from 0 to 50 or 20
to 70, this adjusting has to go automatically.
As far as I know the adjusting goes automatically by the data, when the data
exceeds the 50, the adjusting goes bigger than 50, and then the the chart
isn't according the ISO.