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

COCONet GPS Network - CN57-CN57Toco_TTO2021 P.S.
Start: 17-Feb-2020
End: 14-Nov-2022
UNAVCO Community, 2021, COCONet GPS Network - CN57-CN57Toco_TTO2021 P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/2QP4-V554