axis, index, value: see documentation of axis procedure for
         the meaning of these parameters

         none

         none

         the function returns an exponentially formatted string of the
         form '10^x' or '1x10^Y'

         none

         ...are evil :-)

         none

         explabel should not be used for axes spanning less than a few
         decades because the exponential numbers returned have only one
         significant digit of precision

         trivial

     written sometime back in 1993 or 1994 by Joern Wilms
     $Log: explabel.pro,v $
     Revision 1.3  2003/06/19 09:50:52  wilms
     improved roundoff check
     Revision 1.2  2002/07/26 07:40:50  wilms
     better check whether mantissa is different from unity (now avoids roundoff)

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