mfgGridResolution, DBUperUU relation to stepper resolution

hi all, 

I am wondering if someone could tell me more about the correct setting of mfgGridResolution and DBUperUU for a technolgy file for a CMOS technology that uses i-line stepper (365nm) which resolution is 0.8.

As the the standard (default) of mfgGridResolution is 0.001 but this seems too fine resolution  for 0.8um technology and dbuperuu value  of 1000 seems too high.

Thanks