| http://www.w3.org/ns/prov#value | - All pictures were taken with models looking straight ahead with different types of expressions (neutral and six basic facial emotions: happy, surprise, disgust, sad, fear, and angry), are in black-and-white and are described by means of intensity scores ranging from 1 to 9 (1 = low intensity and easy to recognize, 9 = high intensity and hard to recognize).
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