CCL: More digits in Gaussian thermochemistry

[Daniel Singleton <singleton-.at.-mail.chem.tamu.edu>]

Hey - Does anyone know an easy way to get more digits out of Gaussian
 in its thermochemistry  output after a frequency calculation?  Six
 digits after the decimal point may seem like plenty but when you are
 looking at 13C isotope effects, it isn't enough.  I can't seem to find
 the iop I would have expected.
 I have independent ways to predict the isotope effects well - that
 isn't the issue - but I wanted to do it via the thermochemistry
 predictions in Gaussian because that would let me look at contributing
 factors to the isotope effects in a different way.  I also know that I
 can refigure the thermochemistry for myself from the frequencies, etc,
 but I am trying to avoid that work.
 Thanks in advance.
 Dan Singleton