# Do not put d0 after real constant in gnuplot script.
# Meaning of d0 is completely different from that in Fortran.
g=9.8
f(x)=sqrt(2*x/g)

set ylabel 'Time (sec)'
set xlabel 'Height (m)'
set key 16.0, 0.8

plot	"ex0721.dat" using 1:2 title "Baseball" with linespoints,\
	"ex0722.dat" using 1:2 title "Football" with linespoints,\
	f(x)                   title "No Friction" with lines

pause -1