set title  " Promedio Busqueda  v/s factor de carga"
set xlabel " factor de carga"
set ylabel " Promedio Busqueda "
set yrange [0:25]
set grid
plot "tablaB.dat" using 1:2 title "Curva experimental" with lines 3,\
 "tablaB.dat" using 1:3 title "curva teorica" with lines 4
pause -1