title: Repeating y-axis tick labels
body: <p>I found this strange behaviour when using gnuplot (ver 4.4), it repeats the same y-axis ticks labels when <em>set format y "%10.0f"</em> command is used and y range is relatively low. If I set it up to "%10.5f" the numbers don't repeat but the "0.5" rounding isn't logical in my case. So I'm looking for a solution with minimal changes to the following script, any help appreciated!</p>
  
  <p>Example with repeating y-axis ticks labels:
  <img src="https://i.stack.imgur.com/u2ktJ.jpg" alt="Example with repeating y axis tics-labels"></p>
  
  <p>Data:</p>
  
  <pre><code>0.5 -
  1   3.000
  2   4.000
  3   4.000
  4   2.000
  5   1.000
  </code></pre>
  
  <p>Script:</p>
  
  <pre><code>set encoding cp1250
  set datafile separator "\t"
  set datafile missing "-"
  
  set terminal png font "arial" small size 1090,282 xffffff x000000 x404040 x00aa66     xdd3300
  set output "output.png"
  
  set key off
  
  set grid
  set boxwidth 0.9 relative
  set style data histograms
  set style fill solid 0.6 border -1
  set decimalsign ","
  set format y "%10.0f"
  set xtics ('28.02.2011-06.03.2011' 1,'07.03.2011-13.03.2011' 2,'14.03.2011-20.03.2011'     3,'21.03.2011-27.03.2011' 4,'28.03.2011-03.04.2011' 5)
  set ylabel 'Label'
  set xrange [0.5:5.5]
  plot "data.dat" using 2
  </code></pre>