Fig. 3: Irreproducibility of AzPy thermal isomerization kinetics.
From: A cautionary tale of basic azo photoswitching in dichloromethane finally explained

Thermal isomerization kinetics of AzPy in DCM for three replicate aliquots (Rep. 1, Rep. 2, Rep. 3) of the same stock solution (~ 10ā5āM), demonstrating irreproducibility due to trace water. Each sample curve is normalized to its \({A}_{\infty }\) value. UV-vis measurements were performed at 21ā°C.