E|------------------------------------------------------------------------------|
B|------------------------------------------------5-----------------------------|
G|------7-----7--5---7-5-7-5----7-----7--5--7--5-----5--------------------------|
D|---0-----0-----------------0-----0--------------------------------------------|
A|------------------------------------------------------------------------------|
E|------------------------------------------------------------------------------|

Something like this is played in place of chords in Substance version:

E|-----------------------------------------|
B|--------------5----8----5----------------|
G|-----5--7--5----5----5-----5--7--5-------|
D|-----------------------------------------|
A|-----------------------------------------|
E|-----------------------------------------|

Chords in live version:

E|------------------------------------------------------------------------------|
B|------------------------------------------------------------------------------|
G|-----12--12--12--12--12-----12--12-----12>10--10--10--10----------------------|
D|-----12--12--12--12--12-----12--12-----12>10--10--10--10----------------------|
A|-----10--10--10--10--10-----10--10-----10>8---8---8---8-----------------------|
E|------------------------------------------------------------------------------|


E|------------------------------------------------------------------------------|
B|------------------------------------------------------------------------------|
G|------9---9---9---9---9------9---9------9>7---7---7---7-----------------------|
D|------9---9---9---9---9------9---9------9>7---7---7---7-----------------------|
A|------7---7---7---7---7------7---7------7>5---5---5---5-----------------------|
E|------------------------------------------------------------------------------|

Additional chords (both versions, toward end of song):

E|--------------------------------|
B|--------------------------------|
G|--14--14---14--14--14>12--------|
D|--14--14---14--14--14>12--------|
A|--12--12---12--12--12>10--------|
E|--------------------------------|

Hopefully, this is a reasonable facsimile of the guitar played on Incubation on
the Shadowply bootleg (or the Cross of Iron 7" which contains Incubation (Cross
of Iron) and the rather apocalyptic live version of Heart and Soul both from
the Shadowplay performance.)  Not included is the acoustic guitar Ian is
plinking on in the live version.