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Normalized ensemble-averaged velocity in the direction of flow in a small sub-area (Fig. 3) obtained by PIV, DES-SST (DES), SC, SM and SF. Iso-contours defined by 〈uc〉no: 〈uc〉no = 1.2 (––); 〈uc〉no = 0.8 (– –); 〈uc〉no = 0.6 (–-–-); 〈uc〉no = 0.4 (····). Vertical black lines indicate the end of Zone I (maximum velocity) and Zone II (defined by 〈uc〉no = 1.2), respectively, in terms of the jet centerline.