The dw parameters were all 0.0 and kex 1e5, both of which result in no exchange. If this is ever
used for an optimisation starting point - which it never should, apart from development, test suite,
and debugging purposes - then the optimisation algorithm will have a very hard time recovering. The
pA parameter has been changed to 0.90 to set it to a reasonable value while still staying far away
from the no exchange condition of pA = 1.0.
This follows from http://article.gmane.org/gmane.science.nmr.relax.devel/5917.
