How can I get the Bar Chart with fixed bar height regardless of the amount of values present in the chart?

[marziaolla]

Hello,
I would like the bars of my bar chart to always have the same height regardless of how many values are present in the chart.

Is it possible to do it?

I tried to insert the option charting.chart.barSpacing and charting.chart.columnSpacing in the XML, but I did not get the result I wanted.

Thanks.
Marzia