title: Same size of plus and minus signs in title using gnuplot
body: <p>I'm trying to plot a couple of different graphs in <code>gnuplot</code>, using the <code>epslatex</code> terminal. 
  The legend for each graph is constructed on the form <code>title "A=-1.2345+6.7890i"</code> (essentially a complex number), but with different numbers. </p>
  
  <p>Now for my problem: <em>The plus and minus signs in different titles have different horizontal length</em>. </p>
  
  <p>I'd like the labels to have aligned real and imaginary parts, but if the length of the plus/minus signs are different, this is not the case. </p>
  
  <p>So, my question is, is there any way to set the plus and minus signs in the legend to have the same horizontal length?</p>