set yrange [-3:4]
set xrange [0.05:13.7]
set xtics 3.14
#set x2tics 2.72                ## buggy in v5.2 patchlevel 2

  plot sin(x) with lines lw 3 lc 6 title "sin"
replot log(x) with lines lw 3 lc 7 title "ln"
pause -1
  
set xtics 2.72                  ## remedy to above bug
  plot sin(x)+log(x) with lines lw 3 lc 1 title "sin+ln"
replot sin(x)*log(x) with lines lw 3 lc 2 title "sin*ln"
pause -1