set key [ <position> ... ] [<xoffset>, <yoffset>]
The setting key determines whether a legend is placed on a plot, and if so, where it should be located on the plot. Issuing the command:
set key
simply causes a legend to be added to the plot in its default position, usually the plot’s upper-right corner. The converse action is achieved by:
set nokey
or:
unset key
both of which cause a plot to have no legend. A position for the key may also be specified after the set key command, for example:
set key bottom left
Recognised positions are top, bottom, left, right, below, above, outside, xcentre and ycentre. In addition, if none of these quite achieved the desired result, a positional offset may be specified after one of the position keywords above. The first value is assumed to be an -offset, and the second a
-offset, in centimetres. For example:
set key bottom left 0.0, -0.5
would display a key below the bottom left corner of the graph.