The song has standard tuning, EADG

The song doesnt have that much true bass guitar in it, but if you classify the low stuff 
as bass, here it is:

G----------------------------|
D----------------------------|
A----------------------------|
E----5----8--8-8/////5-------|

Although this part doesnt show up in the recorded version on the album, Its there when 
Yorke says "When you're breathing" and such in live versions and from in the basement.

G---------------------12-14-----------------12-14-|
D------------------14--------------------14-------|
A-----12---14--15-----------12---14--15-----------|
E-------------------------------------------------|(repeat a bunch)