discontinuities in stress tensor mask in thin air

["mikeshonle" <mike@xxxxxxxxxxxxx>]

Hi, I'm trying to increase accuracy by having different regions (all 
of type 'air') have different mesh spacings (starting at .005 and 
then increasing by about 10% at each concentric region). However, 
when I compute the force and then plot the stress tensor mask, the 
lines abrubtly change direction at the boundry. I'm working on a 
problem with two magnets, and I'm selecting one and doing the 'Force 
via Wweighted Stress Tensor'. Is there something I'm doing wrong or 
any other ideas or suggestions? I'm using version 3.3a3. And what's 
a good practical upper limit on the number of mesh nodes? I seem to 
start running into problems at around 350,000. Also, I would like to 
thank Mr. Meeker for this excellent program.
Thanks in advance,
-Mike