Unable to plot a decent x-Axis in a time series plot using zoo

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I use the R package zoo to plot a yearly time series of weekly averaged data. The problem is that my date variable (m.all$date) contains week numbers and these are plotted as x-Axis. What I would rather like to to is plot abbreviated months.

I can suppress the x-Axis in the plot using xaxt = "n" in the plot.zoo command, but cannot define a suitable x-Axis that plot abbreviated months instead.

I tried several variations of the axis.Date() commands without luck!

# Create zoo object for time series plot

z < - zoo(cbind(m.all$obsTPM, m.all$modTPM, m.all$refTPM), m.all$date) names(z)

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