  set output '.\attenuation.png'
  set terminal png
  #eps enhance color solid "Times-Roman" 11
  set size 0.857, 0.680
  set key top left
  set key spacing 1.3
  set missing "-"
  set ytics nomirror
  set xtics nomirror
  #set logscale x
  set xlabel "f [MHz]"
  set ylabel "alpha [dB/cm/MHz]"
  set style line 1 linetype 1 pointtype 9 pointsize 1
  set style line 2 linetype 2 lw 1.5 pointtype 7 pointsize 1
  set style line 3 linetype 3 lw 1.5 pointtype 9 pointsize 1
  plot 'attenuation.txt' using 1:2 title 'measurement'  with lines linestyle  1, 'attenuation.txt' using 1:3 title 'calculation' with lines linestyle  2
