set multiplot
set grid
set size 1,.5
set origin 0,.5
set autoscale y
set xrange [0:240]
set xtics 0,20
set title "Tiempo de Ida y Vuelta de Paquetes"
set ylabel "mili seg"
set xlabel "# Paquete" 
plot "datos" using 1:2 title "Tiempo Paquetes" with linespoints 1
set origin 0,0
set xrange [0:240]
set yrange [0:100]
set xtics 0,20
set title "Porcentaje de Perdida de Paquetes"
set ylabel "% Porcentaje"
set xlabel "# Paquete"
plot "datos" using 1:3 title "Tasa Perdida" with steps 3
reread