title: How to put a symbol at a specific point of a plot with Gnuplot
body: <p><a href="http://gnuplot-tricks.blogspot.it/2009/05/gnuplot-tricks-many-say-that-it-is.html" rel="nofollow noreferrer">Here</a> is provided an example of line breaking in a plot drawn with Gnuplot. </p>
  
  <p>Using arrows, as suggested in the link above, the results depend by the axis, i.e. I can't handle the angle of the arrow with simplicity. The following figure shows an example of an ugly line breaking obtained by the example in the link above. 
  <img src="https://i.stack.imgur.com/oZJNR.png" alt="enter image description here"></p>
  
  <p>To obtain that ugly arrows, I did something like:</p>
  
  <pre><code>x1 = 32
  yb = 0
  yt = 100
  tiny=2
  set arrow 1 from x1-tiny, yb-tiny to x1+tiny, yb+tiny nohead
  set arrow 2 from x1-tiny, yt-tiny to x1+tiny, yt+tiny nohead
  </code></pre>
  
  <p>for the first plot and:</p>
  
  <pre><code>x2 = 33
  set arrow 1 from x2-tiny, yb-tiny to x2+tiny, yb+tiny nohead
  set arrow 2 from x2-tiny, yt-tiny to x2+tiny, yt+tiny nohead
  </code></pre>
  
  <p>for the second.</p>
  
  <p>Hence, instead of using arrows, I wish to use a symbol to be put at the end of the axis. A symbol is in pt and doesn't change with the axis length. I think it should be done by putting a label centered into a specific point.</p>
  
  <p><strong>Which is the code to do that in Gnuplot?</strong></p>