.. _model-surrogate-global-correction-first_order:

"""""""""""
first_order
"""""""""""


Specify that truth values and gradients must be matched.


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**Specification**

- *Alias:* None

- *Arguments:* None


**Description**


This correction specification specifies that the approximation will be
corrected to match truth data. The keyword ``first_order`` matching
ensures that truth values and gradients are matched.