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HEK
 
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Default How to make a Line Chart with shaded uncertainty band

In scenarios, the forecasted values often have a higher uncertainty the
further they are in the future (like a weather forecast). I would like to
show this "uncertainty band" in a line chart. Of course this can be done by
graphing two extra lines for optimistic and pessimistic values, or for any
limit values, but I would like to shade the area between these upper and
lower limits, preferably by a transparent colour so gridlines are still
visible. Anyone with an idea how to do this?
Thanks for your help,
Henk