Fig. 6: Histograms of height distributions for PET film surfaces after reaction times from 0 to 24 h.
From: Temporal and spatial evolution of enzymatic degradation of amorphous PET plastics
With the height mode centred to zero, positive and negative z values represent hills and dales, respectively. The semi-logarithmic plots display the evolution of high-reactivity centres (tailing towards lower z values) in the advanced degradation phase.
