Fig. 2

The size and color intensity of the squares are proportional and consistent with the Pearson correlation coefficient at p < 0.05 in Thymus vulgaris. Red squares indicate positive and significant correlations, while blue squares indicate negative correlations. Pearson’s correlation coefficient for variables on the vertical and horizontal axis is on the correlation scale from − 1 to 1. *Also indicates values that are statistically different at p < 0.05.