How to reverse / invert the y-axis?

To flip or reverse the y-axis: Select the y-axis on your Time chart. Switch to the Presentation properties tab and locate the Scale panel. Under ‘Reverse’ select ‘Yes’.   For more information: Elements of the chart

How to reverse or invert a series?

To reverse the sign of a series, use the following expression in the Series list: -series To invert a series, use this expression in Series list: 1/series For example: 1/eur