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6 pin header

These headers connect the board to the Arduino and allow for additonal boards to be stacked on top of this one. It is important to solder these headers flat on the board, and to keep the solder low to the board to allow the pins to seat firmly on the Arduino board. An easy way to align the headers is to solder only one pin at first on the end. By heating up this solder you can square up the header before soldering on the remaining pins. Do not trim the leads! they must be at full length to properly seat into the Arduino.