title: How to access Gnuplot's (auto)range values and modify them to add some margin?
body: <p>Using the standard plot command, I get, what I want except that the <code>yrange</code> is set automatically from (eg) 275 to 300.</p>
  
  <p>Unfortunately, I have several data points with y-coordinate 300, such that they are not visible (due to border lines, etc.).</p>
  
  <p>So, is there any way to set the maximum <code>yrange</code> such that it is always the maximum data plus e.g. 5 units?</p>
  
  <p>Using <code>autoscale</code>, the <code>yrange</code> is set to 275:300. Setting explicitly the range to 275:305 would work for one data file but not for others. So I need some generic method to determine the max-data point and set the <code>yrange</code> larger.</p>