Can you say a bit more about what you’re looking for / what you’ve tried? Eg are you looking to get plottable values from the model, are you trying to understand how to plot lines, or is it a question of the style of the plot (eg dotted vs solid lines)?
Usually, a minimal example (you could include dummy data for df, or something from RDatasets maybe) with code that someone can run / modify is very helpful. See See here for more tips.