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(gnuplot.info)arrow

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 Arbitrary arrows can be placed on a plot using the `set arrow` command.

 Syntax:
       set arrow {<tag>} {from <position>} {to <position>} {{no}head}
                 { {linestyle | ls <line_style>}
                   | {linetype | lt <line_type>}
                     {linewidth | lw <line_width} }
       set noarrow {<tag>}
       show arrow

 <tag> is an integer that identifies the arrow.  If no tag is given, the
 lowest unused tag value is assigned automatically.  The tag can be used to
 delete or change a specific arrow.  To change any attribute of an existing
 arrow, use the `set arrow` command with the appropriate tag and specify the
 parts of the arrow to be changed.

 The <position>s are specified by either x,y or x,y,z, and may be preceded by
 `first`, `second`, `graph`, or `screen` to select the coordinate system.
 Unspecified coordinates default to 0.  The endpoints can be specified in
 one of four coordinate systems---`first` or `second` axes, `graph` or
 `screen`.  See `coordinates` (Note: Coordinates ) for details.  A coordinate
 system specifier does not carry over from the "from" position to the "to"
 position.  Arrows outside the screen boundaries are permitted but may cause
 device errors.

 Specifying `nohead` produces an arrow drawn without a head---a line segment.
 This gives you yet another way to draw a line segment on the plot.  By
 default, arrows have heads.

 The line style may be selected from a user-defined list of line styles (see
 `set linestyle` (Note: linestyle )) or may be defined here by providing
 values for <line_type> (an index from the default list of styles) and/or
 <line_width> (which is a multiplier for the default width).

 Note, however, that if a user-defined line style has been selected, its
 properties (type and width) cannot be altered merely by issuing another
 `set arrow` command with the appropriate index and `lt` or `lw`.

 Examples:

 To set an arrow pointing from the origin to (1,2) with user-defined style 5,
 use:
       set arrow to 1,2 ls 5

 To set an arrow from bottom left of plotting area to (-5,5,3), and tag the
 arrow number 3, use:
       set arrow 3 from graph 0,0 to -5,5,3

 To change the preceding arrow to end at 1,1,1, without an arrow head and
 double its width, use:
       set arrow 3 to 1,1,1 nohead lw 2

 To draw a vertical line from the bottom to the top of the graph at x=3, use:
       set arrow from 3, graph 0 to 3, graph 1 nohead

 To delete arrow number 2, use:
       set noarrow 2

 To delete all arrows, use:
       set noarrow

 To show all arrows (in tag order), use:
       show arrow