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...9; on this scatterplot ? I tried a solution using lines() or abline() and expressions with mod$coefficients[n], but it becomes very complicated as the number of levels and interactions increase. Maybe my plotting method is totally wrong ? Many thanks for taking time for a newbie. -- C'est curieux chez les marins, ce besoin de faire des phrases (M.A.) ---------------------------------------------------- Fred JEAN - UMR CNRS 6539 / LEMAR Univ. Bretagne Occidentale - Inst. Univ. Europ?en de la Mer Place Nicolas Copernic F-29280 PLOUZANE Pho:+33 (0)2 98 49 86 38 // Fax:+33 (0)2 98 49 86 45

...evels of hydro but as a *zigzag* and lines() commands seem to draw lines going from level 1 to level 3 and then back to level 2 of the x axis (hydro) I hope this description is comprehensible. Could someone explain me how to avoid this ? Many thanks for giving me some of your time. -- C'est curieux chez les marins, ce besoin de faire des phrases (M.A.) ---------------------------------------------------- Fred JEAN - UMR CNRS 6539 / LEMAR Univ. Bretagne Occidentale - Inst. Univ. Europ?en de la Mer Place Nicolas Copernic F-29280 PLOUZANE Pho:+33 (0)2 98 49 86 38 // Fax:+33 (0)2 98 49 86 45