GNU Info

(gnuplot.info)offsets

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 Offsets provide a mechanism to put a boundary around the data inside of an
 autoscaled graph.

 Syntax:
       set offsets <left>, <right>, <top>, <bottom>
       set nooffsets
       show offsets

 Each offset may be a constant or an expression.  Each defaults to 0.  Left
 and right offsets are given in units of the x axis, top and bottom offsets in
 units of the y axis.  A positive offset expands the graph in the specified
 direction, e.g., a positive bottom offset makes ymin more negative.  Negative
 offsets, while permitted, can have unexpected interactions with autoscaling
 and clipping.

 Offsets are ignored in `splot`s (Note: splot ).

 Example:
       set offsets 0, 0, 2, 2
       plot sin(x)

 This graph of sin(x) will have a y range [-3:3] because the function
 will be autoscaled to [-1:1] and the vertical offsets are each two.