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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/).
Signals obtained from four sensors: RGTO SnO2 (upper left side), RGTO SnO2Au (upper right side), MQ3 (low left side), and TGS2611 (low right side). Five measures are shown as an example of the typical sensor responses to apricot.