8.27.50 style

set style { data | function } <style modifier> ...

The set style data command affects the default style with which data from files is plotted. Likewise the set style function command changes the default style with which functions are plotted. Any valid style modifier can be used. For example:

set style data points
set style function lines linestyle 1

would cause data files to be plotted by default using points and functions using lines with the first defined line style.