Fig. 3: The results of free amino acids (FAAs) in dry fermented sausages during fermentation.

a Contents of total FAAs and each class of FAA. Data are presented as mean ± SD. The different letters represent significant differences among samples. b Heatmap of each FAA: the size of the circles represents the content of each FAA across different samples, while the color intensity of the squares reflects the relative abundance of various FAAs within the same sample.