How to add standard deviation curves to a line chart
I would like to add the standard deviation curves to a line chart. On the X axis I have time, and the values are set by expressions in a property control. What I would like to add is two further lines which are +/- 1 Standard deviation from the value in the property control. On another graph, I would like to do the same but to show the 25th percentile and 75th percentile, instead of the +/- 1 s.d. I don't want to show just a horizontal line but one that fluctuates over the time series. Is this possible?