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Clarification regarding allowable data for B.4 HGIO

A bold notice as been added to the top of B.4 Heliophysics Guest Investigator - Open to clarify that All Sky Imagers (ASI) and Ground Magnetometers (GMAG) associated with the THEMIS mission are considered to be part of the Heliophysics System Observatory (HSO) and thus investigations using these data as their primary data source are permitted under the normal rules. Questions regarding this program element in general or this clarification in particular may be addressed to galen.fowler@nasa.gov.