Please note: If you acquire data products from PSL,
we ask that you acknowledge us in your use of the data. This may be done by including text such as
data provided by the NOAA PSL, Boulder, Colorado, USA, from their website at https://psl.noaa.gov in any documents or publications
using these data. We would also appreciate receiving a copy of the relevant publications. This will help PSL to justify keeping
the data freely available online in the future. Thank you!