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The commands section 2.18.2 arrow, section 2.18.22 key, and section 2.18.23 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 section 2.18.51 ticslevel); and `screen` specifies the screen area (the entire area--not just the portion selected by section 2.18.46 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 section 2.18.54 timefmt format string. See section 2.18.70 xdata and section 2.18.54 timefmt. `gnuplot` will also accept an integer expression, which will be interpreted as seconds from 1 January 2000.
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