Influence of cooling rate and holding time on the melting enthalpy of crude oil S cooled from 80 to 30 °C without any holding time after cooling (–●–), with an holding time of 10 s (–○–), with an holding time of 30 s (–▲–), with an holding time of 45 s (–△–), with an holding time of 1 min (–■–), with an holding time of 2 min (–□–), and with an holding time of 5 min (+).