Table 6.

Correlation table between PM and TM. Colours indicate the “goodness” of correlation: yellow = significant; orange = relevant; green = high; blue = excellent.

Correlation TM/PM	Zn	Cu	Pb	Cr	Cd	Ni
P. annua	0.64	0.15	−0.47	−0.47	−0.05	0.87
P. aviculare	0.59	−0.05	0.50	−0.27	0.61	0.62
S. vulgaris	0.56	0.04	−0.28	0.54	−0.02	0.73