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ylab in time series plot (PR#2869)

Prof Brian Ripley <ripley@stats.ox.ac.uk> writes:
When I look up the manual page for `axis.POSIXct' I get the following:

  Functions to plot objects of classes "POSIXlt" and "POSIXct"
  representing calendar dates and times.

  Usage

  plot(x, y, xlab = "", ...)
  axis.POSIXct(side, x, at, format, ...)

  Arguments

   x, at
          A date-time object.
   y
          numeric values to be plotted against x.
   xlab
          a character string giving the label for the x axis.
   side
          See axis.
   format
          See strptime.
   ...rther arguments to be passed from or to other methods, typically graphical parameters.