It seems as though there is only one part to the bass line throughout the entirety of
song but i could of course be wrong.
I'm pretty sure the fingering is correct after watching their 2005 Concert in Reykjavik.
[ Tab from: https://www.guitartabs.cc/tabs/s/sigur_ros/ny_batteri_btab.html ]
1.37
G---7-7--7/h9-|---7-7----7-|
D--9-9--9-----|--5-5--0-5--|
A-------------|------------|
E-------------|------------|
Ends at 7.00
G-------------|
D--9----------|
A-------------|
E-------------|
Wonderful tune.