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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/).
Instantaneous amplitude Probability Density Function (PDF) of the electricity demand IMFs (blue line). In a rotated way (orange line), frequency PDFs (horizontal axis) versus instantaneous frequency (vertical axis) are also depicted.