-plot'openMP-GPU.txt' index 0 using 1:5 t "OpenPM 1 core" with linespoints ls 2,\
- 'openMP-GPU.txt' using 1:2 t "OpenPM 4 cores" with linespoints ls 1,\
+plot'openMP-GPU.txt' index 0 using 1:5 t "OpenMP 1 core" with linespoints ls 2,\
+ 'openMP-GPU.txt' using 1:2 t "OpenMP 4 cores" with linespoints ls 1,\