Hi.
Im plotting data using Fit Y by X.
I would like to plot a pre-known quadratic as a reference line (rather than fitting one to the data shown). I can see how this would be done for a linear fit using Fit Special, linear, then constrain the intercept and slope to what ever values, but when selecting quadratic (or higher orders) from the drop down box it doesnt give you somewhere to input the extra coefficients to constrain.
Can I do it via script instead and if so what would the format be?
Many thanks
