Instrument Host Overview
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    This instrument host is used for those datasets that consist of
    surveys taken, usually over long periods of time, at various
    ground-based observatories.  The VARGBTEL host is used when it is
    not possible or practical to attempt to determine which specific
    observatory and/or telescope was used for individual results
    reported.  Some additional more specific information may be
    available in the published references cited in the corresponding
    data set description.