Help System (web edition)

Time series and line graphs may be plotted like scatter diagrams,
but using an extra specification LINE to join the observation points.

Notation of the time axis:
If you have no time variable in the data, use TIME as the X variable and
enter it in the form TIME(<xvar>) where <xvar> is the variable giving
the labels for the regular time axis.

The default range (scale) of the time axis (TIME) is always from 1 to # of
observations in data, unless otherwise stated by XSCALE.

A LAG specification is also available for relocating the graph in the
current coordinate system and a FILL specification for coloring areas
between time series.

  J = Joint information on scatter diagrams and time series 
  P = More information on plotting in general