plot 'qlimit.32.dat' using 4:6 with lines, \
 'qlimit.33.dat' using 4:6 with lines, \
 'qlimit.34.dat' using 4:6 with lines, \
 'qlimit.35.dat' using 4:6 with lines, \
 'qlimit.36.dat' using 4:6 with lines, \
 'qlimit.37.dat' using 4:6 with lines, \
 'qlimit.38.dat' using 4:6 with lines, \
 'qlimit.39.dat' using 4:6 with lines, \
 'qlimit.40.dat' using 4:6 with lines, \
 'qlimit.41.dat' using 4:6 with lines, \
 'qlimit.42.dat' using 4:6 with lines, \
 'qlimit.43.dat' using 4:6 with lines, \
 'qlimit.44.dat' using 4:6 with lines, \
 'qlimit.45.dat' using 4:6 with lines, \
 'qlimit.46.dat' using 4:6 with lines, \
 'qlimit.47.dat' using 4:6 with lines, \
 'qlimit.48.dat' using 4:6 with lines, \
 'qlimit.49.dat' using 4:6 with lines, \
 'qlimit.50.dat' using 4:6 with lines, \
 'qlimit.51.dat' using 4:6 with lines, \
 'qlimit.52.dat' using 4:6 with lines, \
 'qlimit.53.dat' using 4:6 with lines, \
 'qlimit.54.dat' using 4:6 with lines