title: Gnuplot: Logscale seems to mess things up
body: <p>I put an xlogscale in and it messed up the drawing of the gridlines.  The major x gridlines are no longer the same gray as the major y gridlines, they are the gray of the minor x and y gridlines.</p>
  
  <p>The following to pictures show this.</p>
  
  <p>Any ideas on how this can be fixed?</p>
  
  <p>Thanks</p>
  
  <p><img src="https://i.stack.imgur.com/8GxNJ.png" alt="logscale"></p>
  
  <p><img src="https://i.stack.imgur.com/g27r7.png" alt="No logscale"></p>
  
  <pre><code>#!/usr/bin/env gnuplot
  
  set term pdfcairo size 15cm,10cm
  set output 'FFT.pdf'
  
  set datafile separator '    '
  unset key
  
  set border lw 4 back
  
  set grid mxtics mytics xtics ytics lt 1 lc rgb 'gray70', lt 1 lc rgb 'gray90'
  
  set mxtics 5
  set mytics 5
  
  set xrange [10:10e3]
  
  set title 'Harmonic Distortion'
  set xlabel 'Frequency [Hz]'
  set ylabel 'Output Voltage [dB]'
  
  set mxtics 10
  set logscale x 10
  
  plot 'FFT.dat' using ($1):(20*log10((($2**2)+($3**2))**0.5)-5.49074) with lines lw 4 lc rgb 'red'
  
  set out
  </code></pre>