The following information obtained from UNAVCO's online DOI system: (https://www.unavco.org/data/doi/search/search.html) El Salvador GPS Network - CNR1-Centro Nacional de Registros P.S. Start: 06-Mar-2008 End: 31-May-2021 DeMets, Charles, 2008, El Salvador GPS Network - CNR1-Centro Nacional de Registros P.S., UNAVCO, GPS/GNSS Observations Dataset, https://doi.org/10.7283/T5WS8RBF