To make it clearer, we subtracted the initial curve at 30 °C from the curves at 5 °C and the final curve at 30 °C (after raising back the temperature), and a clear difference is observed in the resulting curves (Figure ). These undulations suggest that lower temperatures induce the formation of a small number of small aggregates in this sample. In addition, there is a hysteresis effect evidenced by the fact that raising back the temperature does not dissolve the aggregates.