[Gretl-users] Regression coefficients

Dear all, I am back with another, perhaps very nooby, question. Namely: I have successfully extracted 3rd-degree regressions from my temperature data. My question is now, how can I find out the exact coefficient of those regressions' x^3 ? More exactly, (how) can I make a new series out of the regression coefficients for each year ? Hoping I am being clear and thanks in advance, Best to all, Marc O'C.