gnuplot

set logscale x 10

set format x "10^{%L}"

set title 'Turbulence Boundary Layer'

set xlabel 'y+'

set ylabel 'U+'

set xrange [1:1e+04]

set grid

set key top left

set key box

plot 'boundary_vlaw.dat' title 'Van Driest profile' with line

replot 'boundary_line.dat' title 'Visc.' with line

replot 'boundary_log.dat' title 'Log.' with line

replot 'Uplus-zplus.dat' title 'Exp.'

set term png

set output 'bl.png'

replot