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More information about CAPE and CSP can be found in the ECMWF Newsletter No.144 here (starts on page 27).
Further details and practical information about the EFI for CAPE and CSP are also available in the help section below the EFI web charts, in the sub-section entitled "EFI for CAPE and CAPESHEAR" here: real-time EFI-related products (select the CAPE or CAPESHEAR chart, then page down to see/open this subsection).
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