functions in graph.i - x

             xytitles, xtitle, ytitle  
 
       -or- xytitles, xtitle, ytitle, [deltax,deltay]  
     Plot XTITLE horizontally under the viewport and YTITLE vertically  
     to the left of the viewport.  If the tick numbers interfere with  
     the labels, you can specify the [DELTAX,DELTAY] in NDC units to  
     displace the labels.  (Especially for the y title, the adjustment  
     may depend on how many digits the numbers on your scale actually  
     have.)  Note that DELTAX moves YTITLE and DELTAY moves XTITLE.  
     WARNING: There is no easy way to ensure that this type of title  
              will not interfere with the tick numbering.  Interference  
              may make the numbers or the title or both illegible.  
interpreted function, defined at i0/graph.i   line 682