$EFPARM group                                (optional, experimental)
 
This group is designed to set additional parameters affecting EFP calculation.
As of now, it contains the following keys:
 
CTCUT is an array of floating-point values setting the cutoff radii
      for each pair of EFP fragment types, interpreted as a
      lower-triangular column-major matrix. Nonnegative value sets a
      cutoff in Bohr units, irrespective of the value of UNITS in
      $CONTRL group. Negative value is interpreted as "no cutoff" (or
      "infinite cutoff").
 
      Currently, gradients are not available for the EFP-with-cutoffs.
 
      Example:
        Suppose, the EFP system contains 8 fragments: first 3 of type
        AAA, then 2 of type BBB, then 3 of type CCC. Then the input is
        interpreted this way:
 
        CTCUT(1)= AAA-AAA, AAA-BBB, BBB-BBB, AAA-CCC, BBB-CCC, CCC-CCC
 
        where III-JJJ is a cutoff radius between fragments of type III
        and JJJ.
      End of example.
 
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