pthread_array_sum.gnuplot: improve plot size

Author: cirosantilli

posix/interactive/pthread_array_sum.gnuplot

@@ -1,14 +1,10 @@
 #!/usr/bin/env gnuplot
-set terminal png size 1024, 1024
+set terminal png size 600, 600
 set style data linespoints
 set key autotitle columnhead
 set output 'pthread_array_sum.png'
-set title font ",20"
-set xlabel font ",16"
-set ylabel font ",16"
-set lmargin 12
-set bmargin 4
-set title "Array sum time elapsed in function of threads"
+set title font ",16"
+set title "Array sum time elapsed / N threads"
 set xlabel "threads"
 set ylabel "time (s)"
 plot 'pthread_array_sum.dat' using 1:2 notitle