Selecting the Constraints
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    :class: underline

For session processing, NGS recommends :underline:`constraining only the hub` in all three dimensions ("3D" - latitude, longitude, and ellipsoid height). All other CORSs are unconstrained, as are all user marks. If a mark is selected as a constraint, the coordinate fields in OP become editable, but note that NGS does not recommend altering any coordinate except under exceptional circumstances.

.. caution::  

    NGS does not recommend altering any coordinates during session processing

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