1) WMO WDCGG publications and data are to be used only for non-profit purposes.

2) All users accept the following conditions set forth by the Commission for Atmospheric Sciences (CAS) WG and supported by the Thirteenth Session of CAS: "For scientific purposes, access to these data is unlimited and provided without charge. By their use, you accept that an offer of co-authorship will be made through personal contact with the data providers or owners whenever substantial use is made of their data. In all cases, an acknowledgement must be made to the data providers or owners and the data centre when these data are used within a publication."