set style data line
set xrange [0.00:6.0]
set yrange [0.00:0.05]
set grid
set label "(sigma pt)/pt" at 0.2,0.045
set label "pt (GeV/c)" at 5,0.002

plot \
"rezest_mar07.txt" using 2:4 with lines linewidth 3 title "dual cathode, March 2007", \
"rezest_cd3.txt" using 2:4 with lines linewidth 3 title "dual cathode, February 2008", \
"rezest_wires.txt" using 2:4 with lines linewidth 3 title "wires only"