"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 to the data centre when these data are used within a publication."

Advanced Global Atmospheric Gases Experiment Science Team(AGAGE), Global Monitoring Laboratory, NOAA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Japan Meteorological Agency, Korea Meteorological Administration, Meteorological Research Institute, National Institute for Environmental Studies, National Institute of Meteorological Research, KMA, New Energy and Industrial Technology Development Organization, Norwegian Institute for Air Research, University of Urbino, Dep. of Pure and Applied Sciences (DISPEA),

Alcide di Sarra (ENEA), Bradley D. Hall (NOAA), Chris Lunder (NILU), Damiano Sferlazzo (ENEA), Debra J. Mondeel (NOAA), Dickon Young (UNIVBRIS), ENYO Kazutaka (JMA), Francesco Monteleone (ENEA), Geoffrey S. Dutton (NOAA), Haeyoung Lee (KMA), J. David Nance (NOAA), James W. Elkins (NOAA), Jgor Arduini (UNIURB), KADONO Koji (JMA), KANSO TECHNOS (KANSO), Kazuhiro Tsuboi (MRI), Martin Vollmer (Empa), Michela Maione (UNIURB), Ove Hermansen (NILU), Paul Krummel (CSIRO), Ray F. Weiss (SIO), Ray Wang (EAS), SAITO Kazuyuki (JMA), Salvatore Piacentino (ENEA), Simon O'Doherty (UNIVBRIS), Stefan Reimann (Empa), Takuya Saito (NIES), Tatiana Di Iorio (ENEA), WDCGG; All CFC-11 data contributed to WDCGG by GAW stations and mobiles by 2020-09-28, https://doi.org/10.50849/WDCGG_CFC11_ALL_2020 (Reference date^*: YYYY/MM/DD)

* As the reference date, please indicate the date you downloaded the files.