Supplementary Figure 1: Examples of invalid decay curves

A: This picture illustrates a noisy curve that can be obtained when the incorrect focus is used or upon a too short time for data acquisition. B: This curve shows a rapid decrease in the fluorescence intensity, likely due to the fluorescence of chlorophyll (chloroplasts close to the nucleus) or to the use of altered solutions that damaged the samples. C: Incorrect synchronization of the system leads to noisy curve associated with two peaks (arrows).