The label tag allows the author to place text at any position on the plot. There may be many label tags on one plot and all the labels which fall within the plot will show. The color used will be to foreground color of the plot and the font will be the size specified for the plot, both of which are set in the gnuplot tag (see "Authoring Dynamically Generated Plots" section ).
The text to be placed on the plot must be entered as well.