I make a chart with x-axix values from let's say 1E-9 to 1E-3, using
logaritmic scale. So far so good.

But my need is not to display the values in the chart like 1E-9, 1E-8, etc.
but like 10-9, where the -9 text will be formated as upper index.

Thx for any help or suggestion.