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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Intensity values computed for Child 2 for the action units involved in the production of the Fear expression and related to the upper face part (from left to right, top to bottom AU1, AU2, AU4 and AU5).