FIG 4.

Visual representation of the aroma production of the hybrids generated, together with the results for their corresponding parental strains and the average results for 7 Saaz-type and 10 Frohberg-type S. pastorianus strains. Colors represent the range of calculated Z-scores (calculated over the columns), with blue indicating lower-than-average production, white indicating average production, and red indicating higher-than-average production of the aroma compound in question. Pairwise similarities were calculated by Euclidean distance, and a UPGMA clustering algorithm was applied to cluster the data. The hybrids selected for further pilot-scale fermentation experiments are highlighted by boxes.