In our case, three parameters control the peak finding algorithm: cutoff, distance, and prominence. The cutoff parameter controls how many minutes are ignored at the beginning of the measurement. The second parameter distance is optional and controls how many data points must lie between the identified peaks. The most important parameter is prominence. The parameter is defined as a numeric value. The default value is 1 × 10 -5 W g -1 (the parameters are given as dimensionless numbers. However, it is important to pay attention to whether the experimental heat flow is given in mW g -1 or in W g -1 ). At small prominence values, the peak detection algorithm detects more peaks because the required height of the peak relative to its surroundings is lower. Depending on the prominence setting, the algorithm detects both the C 3 S maximum and the sulfate depletion (at 1 × 10 -5 W g -1 ) (Figure ) or only the C 3 S maximum (at 1 × 10 -4 W g -1 , which is the default value). The calorimetry data for samples containing retarders is more problematic. Here, the unequivocal detection of the time of maximum heat is hampered by overlapping peaks (C 3 S peak and sulfate depletion peak) with only one distinguishable maximum (see Figure ). This is a consequence of the unequal retardation of the C 3 S reaction and the sulfate depletion event. If the C 3 S reaction is retarded more strongly than the sulfate depletion event, both peaks start to converge (see Figure ), and only one peak can be identified with a prominence-based peak detection algorithm. Ultimately, strongly overlapping peaks render the detection and interpretation of the individual heat flow events unreliable.