Details to these files are given in
D. Christen and H. S. P. Mueller:
The millimeter wave spectrum of aGg' ethylene glycol:
The quest for higher precision;
Phys. Chem. Chem. Phys. 5 (2003) 3600 - 3605.

aGg' ethylene glycol is the lowest state conformer.
Ethylene glycol is also known as 1,2-Ethanediol.
It exhibits large amplitude tunneling motion.
Extensive Coriolis interactrion takes place
between the two tunneling sub-states.

Further information will be given shortly -
I hope . . .