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 * With the triple-checked recalibration, the invalid range check is
   causing more harm than good. We've been narrowing this range over
   time, and it's not solving any problems. Kill it with fire.
 * Also raise the delta range to accomodate more variations.

Change-Id: I7c5da6f1b968157528cef30c2c1e8f29bc57a0e7