The identified SG contains 539 data points (ca. 50% of the dataset) and the distribution of X C2H2 for the data points that belong to this SG is shown in red in Fig. . Most of the materials and reaction conditions associated to high, close-to-one conversion values are found within the identified SG. The distribution of S C2H4 for the data points that belong to this SG is shown in red in Fig. . The situations associated with X C2H2 = 0 and S C2H4 = 0 that were present in the dataset (black bar at S C2H4 = 0 in Fig. ) are not part of the SG. The identified SG is described by the rules σ SG X . They constrain the values of three descriptive parameters: