#<<<
cmd:=0'|
#set term wxt  # X11
unset key  # Only one data set, so the key is uninformative

plot '-'   # '-' can be replaced with a filename, to read data from that file.
  0   2.7
  1   2.8
  2  31.4
  3  38.1
  4  68.0
  5  76.2
  6 100.5
  7 130.0
  8 149.3
  9 180.0
e
|;
#<<<

gnuplot:=System.popen("gnuplot","w");
gnuplot.write(cmd); gnuplot.flush();
ask("Hit return to finish"); gnuplot.close();