Labels and Suchlike

set xlabel "label"

Define the label that appears below the x-axis.

set ylabel "label"

Define the label that appears beside the left y-axis.

set x2label "label"

Define the label that appears above the upper x-axis.

set title "label"

Define an overall label for the plot.

set label "label" at x,y

Place a label at the specified location (specified in "plot" units).

set arrow from x,y to r,s

Draw an arrow between the specified points (in "plot" units).

set [no]key

Show [don't show] a key identifying each graph.