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(gnuplot.info)Coordinates

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 The commands `set arrow` (Note: arrow ),  `set key` (Note: key ), and
  `set label` (Note: label ) allow you to draw something at an arbitrary
 position on the graph.  This position is specified by the syntax:

       {<system>} <x>, {<system>} <y> {,{<system>} <z>}

 Each <system> can either be `first`, `second`, `graph` or `screen`.

 `first` places the x, y, or z coordinate in the system defined by the left
 and bottom axes; `second` places it in the system defined by the second axes
 (top and right); `graph` specifies the area within the axes---0,0 is bottom
 left and 1,1 is top right (for splot, 0,0,0 is bottom left of plotting area;
 use negative z to get to the base---see `set ticslevel` (Note: ticslevel ));
 and screen specifies the screen area (the entire area---not just the portion
 selected by `set size` (Note: size )), with 0,0 at bottom left and 1,1 at
 top right.

 If the coordinate system for x is not specified, `first` is used.  If the
 system for y is not specified, the one used for x is adopted.

 If one (or more) axis is timeseries, the appropriate coordinate should
 be given as a quoted time string according to the `timefmt` (Note: timefmt )
 format string. See `set xdata` (Note: xdata ) and set timefmt.  .  `gnuplot`
 (Note: gnuplot ) will also accept an integer expression, which will be
 interpreted as seconds from 1 January 2000.