set title "Particle Trajectory"
set xlabel "x"
set ylabel "y"
set xrange [-2:20]
set yrange [-20:2]
set xtics 2
set ytics 2
set size square
set grid
plot "co54data0.dat" w l title "No Friction (Part 1)", "co54data1.dat" w l title "Friction (Part 2)", "co54data2.dat" w l title "E Field (Part 3)"