set style data line
set label "theta = 8 degrees" at 2,0.0400
set label "B = 2.0 T" at 2,0.0390
set label "pos. res. = 150 microns" at 2,0.0380
set label "pion mass" at 2,0.0370
set label "length of detector = 3.57 - 1.90 m" at 2,0.0360
set label "no. of pos. meas. = 24" at 2,0.0350
set xrange [0.00:4.0]
set yrange [0.00:0.06]
set grid
plot "march.txt" using 2:4 title "March 2007", "now.txt" using 2:4 title "February 2008", "wires.txt" using 2:4 title "wires only"