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I am trying to plot P10 and P90 trendlines onto a scatter plot.

Sophie Osborne

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I have made a scatter plot that I have added a straight line fit to. Additionally, I would like to add a straight line at P10 and P90, but I don't want it to be just vertical or horizontal (i.e. it needs to have a slope). I'm assuming I would use the curve draw feature, but I do not know what the expression would look like to create these lines. Thank you.
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