RE>
<h4><a name="Exceptions">Exceptions</a></h4>
<PRE>
  
   1) If any of the function arguments are SpiceCells of type
      other than double precision, the error SPICE(TYPEMISMATCH)
      is signaled.

   2) If the difference of the two windows results in an excess of 
      elements, the error SPICE(WINDOWEXCESS) is signaled. 
 </PRE>
<h4><a name="Files">Files</a></h4>
<PRE>
 
   None. 
 </PRE>
<h4><a name="Particulars">Particulars</a></h4>
<PRE>
 
   Mathematically, the difference of two windows contai