Riff 1                           3x   (1x)        1x
e[-----------------------------|--------------|----7---------]
b[-----------------------------|--------------|----9---------]
g[-----------------------------|--------------|----7---------]
d[-----------------------------|--------------|----9---------]
a[7-5-4-5--------------7-5-4-5-|7-7-9-9-7b9b7-|----7---------]
e[--------4-5-7-5-4-0----------|--------------|--------------]
Riff 2
e[-----------------------------------------------------------]
b[-----9-9-----9-9-----9-------------------------------------]
g[-----7-7-----7-7-----7-------------------------------------]
d[-----9-9-----9-9-----9-------------------------------------]
a[-x-x-7-7-x-x-7-7-x-x-7-------------------------------------]
e[-0-0-----0-0-----0-0---------------------------------------]
Riff 3                                 Riff 4
e[------------------------------------|----------------------]
b[------------------------------------|----------------------]
g[------------------------------------|-----------7(harmonic)]
d[-2-2-x-x-2-2-x-x-2-2-x-x-5-5--------|-2-2------------------]
a[-2-2-x-x-2-2-x-x-2-2-x-x-5-5-4-5-7--|-2-2------------------]
e[-0-0-x-x-0-0-x-x-0-0-x-x-3-3--------|-0-0------------------]

The Part between the two heavier riffs I can't hear well enough
to tab, but they are in that same scale as the first riff.