set style line 2 lc rgb '#dd181f' lt 1 lw 2 pt 5 ps 1.5 # --- red
plot 'EA_DK.txt'index 0 using 1:2 t "EA with sparse polynomials" with linespoints ls 1,\
'EA_DK.txt'index 0 using 1:4 t "EA with full polynomials" with linespoints ls 2,\
set style line 2 lc rgb '#dd181f' lt 1 lw 2 pt 5 ps 1.5 # --- red
plot 'EA_DK.txt'index 0 using 1:2 t "EA with sparse polynomials" with linespoints ls 1,\
'EA_DK.txt'index 0 using 1:4 t "EA with full polynomials" with linespoints ls 2,\