Hi Steve and all
The requirements that say a hole does not need to be filled is a fact
HOWEVER if it is filled it must be at least 75% filled.  This value is
a result of a great deal of data and was recently re-affirmed by 001.

The reliability of a hole is the best when either completely (>75%)filled
or completely empty.  Fill that is inbetween has proven to degrade
reliability.

Susan Mansilla
Robisan Lab

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