The following information obtained from UNAVCO's online DOI system:
(https://www.unavco.org/data/doi/search/search.html)

Yellowstone Caldera GPS Network - OFW2-Old Faithful 2 P.S.
Start: 18-Nov-2003
End: 14-Nov-2022
UNAVCO Community, Smith, Robert B., 2003, Yellowstone Caldera GPS Network - OFW2-Old Faithful 2 P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5Q52MZT

Yellowstone Caldera GPS Network - OFW2-Old Faithful 2 P.S.
Start: 18-Nov-2003
End: 31-Aug-2007
Smith, Robert B., 2003, Yellowstone Caldera GPS Network - OFW2-Old Faithful 2 P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5ZP44FD

Yellowstone Caldera GPS Network - OFW2-Old Faithful 2 P.S.
Start: 31-Aug-2007
End: 14-Nov-2022
UNAVCO Community, 2003, Yellowstone Caldera GPS Network - OFW2-Old Faithful 2 P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5TX3CP7