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. 2019 Jan 30;272:251–257. doi: 10.1016/j.foodchem.2018.07.226

Fig. 1.

Fig. 1

Principle component analysis (Bi-plot) of the aroma of Arabica, Robusta and acetic acid treated Robusta coffee (0, 1, 2, 3, 4, and 5% acetic acid).