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

CAP Andes GPS Network - CHML-Chos Malal P.S.
Start: 02-Apr-2010
End: 08-Mar-2016
Smalley, Jr., Robert, Brooks, Benjamin, 2010, CAP Andes GPS Network - CHML-Chos Malal P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5WD3XW0