set xlabel "runs"
set ylabel "seconds"
-plot [0:] [0:] 'times-c.log' using 3 title 'ISAMC(user)' with linespoints, 'times-b.log' using 3 title 'ISAMB(user)' with linespoints, 'times-c.log' using 2 title 'ISAMC(total)' with linespoints,'times-b.log' using 2 title 'ISAMB(total)' with linespoints
+plot [0:] [0:] \
+ 'times-b.log' using 3 title 'ISAMB(user)' with linespoints, \
+ 'times-b.log' using 2 title 'ISAMB(total)' with linespoints, \
+ 'times-c.log' using 3 title 'ISAMC(user)' with linespoints, \
+ 'times-c.log' using 2 title 'ISAMC(total)' with linespoints, \
+ 'times-d.log' using 3 title 'ISAMD(user)' with linespoints, \
+ 'times-d.log' using 2 title 'ISAMD(total)' with linespoints
set output "times.ps"
set terminal postscript
replot