double precision fex0, fexx, fexy
      double precision fexxx, fexyy, fexxy
      double precision fey0, feyx, feyy
      double precision feyxx, feyyy, feyxy
      double precision fez0, fezx, fezy
      double precision fezxx, fezyy, fezxy
      double precision fnfex, fnfey, fnfez, xfe,yfe