Teensy 2.0...what is the extra set of bottom pads for?

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Burly

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There are 3 sets of empty pads on the bottom of a Teensy 2.0

1. One set is to hold a 3.3 regulator chip.
2. Then a series of 3 pads controls the chip voltage from 5 to 3.3 volts by cutting a jumper and bridging two pads with solder.

3. Then there is a third set of pads(2 pads) that have no indication of what they are for?
What are they for?
 
An extra optional capacitor. This one on the schematic:

schematic2.png
 
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