To allow extraction of PET from the CGIAR-CSI Global aridity and PET database (http://www.cgiar-csi.org/data/global-aridity-and-pet-database), you must manually download the file 'Global PET - Annual.zip' from the above url (follow 'Download from the HarvestChoice Dropbox'), and unzip it in some directory. Then set the path with options() as shown below in the examples.
Dataframe with longitude, latitude
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