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. 2019 Oct 15;147(2):171–181. doi: 10.1017/S0031182019001379

Fig. 4.

Fig. 4.

Distribution of VOCs according to our occurrence-focused rule (1 bar per VOC class) and to the SIMPER ranking (different grey levels). ‘Hen odour’, VOCs that compose the signature typical of the hen odour in the present conditions, ‘increased’, VOCs the amount of which was strongly increased during feed supplementation (incl. VOCs that were only detected during feed supplementation), ‘reduced’, VOCs the amount of which found to be decreased during feed supplementation, ‘bulk’, VOCs with no obvious segregating pattern. ‘Least’, ‘mid-’, ‘most discriminating’, VOCs with a SIMPER rank between 1 and 15 (15 VOCs with the highest contribution (30%) to the discrimination in the SIMPER analysis), between 16 and 52 and between 53 and 87 (34 VOCs contributing the last 12% of the discrimination) respectively.