introducing jitter in overlapping graphs using ggplots (plotmeans). Also sciplot.

Hi,

I want to plot means with standard deviations of Total Nitrogen (TN) across
4 stations (S1-S4) and over 3 years (2007-2009). I want this plot in one
panel.
I do not want medians (bwplot, boxplot).
...

Hi Anna,
 From your description, the brkdn.plot (plotrix) function might do what 
you want. In common with other functions in plotrix, brkdn.plot uses 
offsets rather than jittering to prevent overplotting.

Jim