xgraph
use the xgraph(1) program for plotting.
General form
xgraph file [exprs] [plot options]
The Spice3f5 xgraph command plots data like the plot command but via xgraph, a popular X11 plotting program.
If file is either "temp" or "tmp" a temporary file is used to hold the data while being plotted. For available plot options, see the plot command. All options except for polar or smith plots are supported.