set style data line
set label "theta = 8 degrees" at 3,0.0300
set label "B = 1.0 T" at 3,0.0290
set label "pos. res. = 300 microns" at 3,0.0280
set label "pion mass" at 3,0.0270
set label "length of detector = 4.0" at 3,0.0260
set label "no. of pos. meas. = 24" at 3,0.0250

plot "rl_0.01.txt" using 2:4 title "1%", "rl_0.02.txt" using 2:4 title "2%", "rl_0.03.txt" using 2:4 title "3%", "rl_0.04.txt" using 2:4 title "4%", "rl_0.05.txt" using 2:4 title "5%"