set term postscript enhanced portrait "Helvetica" 12
set ylabel "execution times (in s)"
-set xlabel "polynomial's degrees"
-#set logscale x
-#set logscale y
+set xlabel "Sparse polynomial's degrees"
+set logscale x
+set logscale y
#set key on outside left bmargin
set style line 1 lc rgb '#0060ad' lt 1 lw 2 pt 1 ps 1.5 # --- blue