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

Chignik GPS Network - UGAI-UGAI_CHIG_AK2021 P.S.
Start: 21-Aug-2021
End: 31-Jul-2022
Grapenthin, Ronni, Freymueller, Jeffrey T., Elliott, Julie L., 2022, Chignik GPS Network - UGAI-UGAI_CHIG_AK2021 P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/H8J4-XS43