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. 2022 Feb 25;12:771636. doi: 10.3389/fmicb.2021.771636

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Copyright © 2022 Vaccalluzzo, Celano, Pino, Calabrese, Foti, Caggia and Randazzo.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Spearman correlation matrix between VOCs (black font characters) and microbial groups (red font characters) detected values after 15 and 80 days of fermentation in olive drupes. The normalized scaled matrices were merged and used for correlation computing. Only statistically significant correlations (p < 0.05) were plotted. The color graduated scale ranges from −1 (green: negative correlations) to 1 (orange: positive correlations). Blue delimited square marked the outgroup comparisons.