title: Removing blank gap in gnuplot multiplot
body: <p>I am using multiplot in gnuplot to insert four graphs in the single figure. My code looks like this:</p>
  
  <pre><code>set term postscript eps enhanced color
  set xlabel 'i'
  set ylabel 'j'
  set xtics 20
  set ytics 20
  set xlabel font ",20"
  set ylabel font ",20"
  set pm3d map
  set pm3d corners2color c1
  set out "Rulkovpattern.eps"
  set multiplot layout 2,2
  set title "(a)"
  set size square 0.55,0.55
  spl 'patternD0pt02.dat' notitle
  set title "(b)"
  set size square 0.55,0.55
  spl 'patternD0pt04.dat' notitle
  set size square 0.55,0.55
  set title "(c)"
  spl 'patternD0pt06.dat' notitle
  set size square 0.55,0.55
  set title "(d)"
  spl 'patternD0pt08.dat' notitle
  unset multiplot
  set out
  set term wxt
  </code></pre>
  
  <p>This generates the following picture:
  <img src="https://i.stack.imgur.com/tf4eB.jpg" alt="patterns"></p>
  
  <p>But in this picture, there is a lot of blank space in the middle. I would like to make that space disappear or at least make it as minimum as possible. How can I do it by modifying my code?</p>
  
  <p>Thanks in advance</p>