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(gnuplot.info)border

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 The `set border` and `set noborder` commands control the display of the graph
 borders for the `plot` (Note: plot ) and  `splot` (Note: splot )
 commands.

 Syntax:
       set border {<integer> { {linestyle | ls <line_style>}
                               | {linetype | lt <line_type> }
                                 {linewidth | lw <line_width>} } }
       set noborder
       show border

 The borders are encoded in a 12-bit integer: the bottom four bits control the
 border for `plot` and the sides of the base for `splot`; The next four bits
 control the verticals in `splot`; the top four bits control the edges on top
 of the `splot`.  In detail, the `<integer>` should be the sum of the
 appropriate entries from the following table:

                         plot border     splot         splot
           Side          splot base    verticals        top
       bottom (south)         1            16           256
       left   (west)          2            32           512
       top    (north)         4            64          1024
       right  (east)          8           128          2048

 The default is 31, which is all four sides for `plot`, and base and z axis
 for `splot`.

 Using the optional <line_style>, <line_type> and <line_width>
 specifiers, the way the border lines are drawn can be influenced
 (limited by what the current terminal driver supports).  By default,
 the border is drawn with twice the usual linewidth.  The <line_width>
 specifier scales this default value; for example, `set border 15 lw 2`
 will produce a border with four times the usual linewidth.

 Various axes or combinations of axes may be added together in the command.

 To have tics on edges other than bottom and left, disable the usual tics and
 enable the second axes.

 Examples:

 Draw all borders:
       set border

 Draw only the SOUTHWEST borders:
       set border 3

 Draw a complete box around a `splot`:
       set border 4095

 Draw a partial box, omitting the front vertical:
       set border 127+256+512

 Draw only the NORTHEAST borders:
       set noxtics; set noytics; set x2tics; set y2tics; set border 12