This is the main riff played by the string section at various points:
e|--------------------------------|
B|-14-12-12-----------------------|
G|----------11-14-12-12-----11----|
D|----------------------12-----14-|
A|--------------------------------|
E|--------------------------------| x2
Then later:
e|--------------------------------|--------------------------------|
B|-14-12-12-----------------------|-14-12-12-----------------------|
G|----------11-14-12-12-----11----|----------11-13-14--------------|
D|----------------------12-----14-|--------------------------------|
A|--------------------------------|--------------------------------|
E|--------------------------------|--------------------------------|