I fitted the following model: dgr.lme2 <- lme(Average ~ poly(Time, 2) * Treatment, random = ~1|Replicate, data = dgr, correlation = corAR1(), method = "ML") I plotted the data in separate panels for each Treatment: xyplot(Average ~ Time|Treatment, groups = Replicate, data = dgr, type c("p","l"), ylab = expression(paste(Delta, G))) I would now like to overlay the population-level predictions from dgr.lme2 onto each Treatment-level panel. How can I tell plot.augPred to do this? Or do I need a bespoke panel function? (plot.augPred gives panels for each Replicate by default) Many thanks, Dan Bebber Checked by AVG Free Edition. 11:51