Coordinates

The commands set arrow, set key, and set 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 5#5system6#6 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 (p. )); and screen specifies the screen area (the entire area -- not just the portion selected by set 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 format string. See set xdata (p. ) and set timefmt (p. ). gnuplot will also accept an integer expression, which will be interpreted as seconds from 1 January 2000.