Crippling Blow Intro Tab

Hi!
 
The chords are up here already(ver 2 is spot on!), but I think i've got the riff! Et voila:
 
Tabbed by: soupdragon
Email: why would I tell you?
 
Tuning: Standard (If you want to tune your guitar like Keuning does - Eb -, just play
in this tab 1 fret higher!)
 
e|-------------------------------------------------------------------------|
B|-------------------------------------------------------------------------|
G|--4--4-4-4---------------------------------------------------------------|
D|--6--6-6-6---------------------------------------------------------------|
A|--6--6-6-6---------------------------------------------------------------|
E|--4--4-4-4--4/7~---------------------------------------------------------|
 
Over the third and fourth repeat of this riff,this little riff is played once:
e|---------------------------|
B|--16--14-------------------|
G|----------16--13-----------|
D|---------------------------|
A|---------------------------|
E|---------------------------|
X