Fig. 3
From: Does the natural carcinogen ptaquiloside degrade readily in groundwater?
Relative PTA concentration vs. time in PTA-groundwater hydrolysis experiments (red triangles) and the corresponding fits with a 3rd degree polynomium (Eq. 2; goodness of fit R2), exept from Control, where no significant degradation took place. Development in pH (blue). Note the short time scale for Villingebaek (fast disappearance of PTA). Error bars show the standard deviation (n = 3)