Blurb::
Datafile of points to assess surrogate quality
Description::
Specifies a data file containing variable and response (truth) values,
in one of three formats:

- ``annotated`` (default)
- ``custom_annotated``
- ``freeform``

The surrogate is evaluated at the points in the file, and the
surrogate (approximate) responses are compared against the truth
results from the file.  All metrics specified with
:dakkw:`model-surrogate-global-metrics` will be computed for the challenge
data.
Topics::

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