I have a generic chart which caters for Positive and Negative values.
If all or at least one point has a positive value, the chart works.
However, if all the values become Negative, e.g -5.50 , -5.80
the Min value becomes -5.50 and the Max value is -5.80, as if the negative sign is being ignored.
The chart is now upside down.
How can a single generic chart work in borth situations?