The replot command without arguments repeats the last plot or splot command. This can be useful for viewing a plot with different set options, or when generating the same plot for several devices.
Arguments specified after a replot command will be added onto the last
plot (splot) command (with an implied ',' separator) before it is
repeated. replot accepts the same arguments as the plot (splot)
commands except that ranges cannot be specified.
See command line-editing for ways to edit the last plot
(splot) command.