Corrigendum: Water Supply 21 (7), 3698–3709: Thermal efficiency improvement of a solar desalination process by parabolic trough collector, Randha Bellatreche, Maamar Ouali, Mourad Balistrou and Djilali Tas, https://dx.doi.org/10.2166/ws.2021.131 (Water Supply, 2023)