You have to tune it in drop C in order to get that low C, but you can
play it in
tuning too if you play everything two frets lower and leave off the
power chord. You also don't
to play the octave, either note by itself will sound alright, but that
way sounds the best.
d|-----------------------------------|
A|----10-11-10---11-10---11-10--8----|
F|-----------------------------------|
C|0---7--8--7----8--7----8--7---5----|
G|0----------------------------------|
C|0----------------------------------|
d|----------------------------------|
A|----10-11-13---11-10---10-11--3---|
F|----------------------------------|
C|0---7--8--10---8--7----7--8---0---|
G|0---------------------------------|
C|0---------------------------------|