Column Chart. Constants
Column Chart. How do I add a constant to a line(horizontal line), for example "average"?
You would create a 2nd series (line) that would draw the line based on the average of the bars. You will need to calc the values for the line series and use that store to draw the line.
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I just created a chart plugin extension that allows for you to include threshold lines and ranges into cartesian series charts
Thought it might interest you.
Very cool.. thanks for sharing.