for the mu.
1) if the area was not previously a location estimate, the measure for the location is less than the entry cutoff, and no other location in the area has a smaller measure than the location, then the location is now considered a location estimate for the mu.
2) if the area was previously a location estimate, the location was not a location estimate, the measure for the location is less than the entry cutoff, no other location in the area has a smaller measure than the location, and the location that was previously a location estimate now has a measure that is greater than or equal to the exit 