In order to avoid artifacts arising in calculations due to differences between experiments carried out on different days, raw data from these experiments was normalized by subtracting the mean (μ) and dividing by the standard deviation (σ) for each experiment separately. Later, this normalized data was combined and used for calculating the PCF and variances for different parameters. (A,B) distributions of cell cycle times (T) before and after normalization. (C,D) distributions of elongation rate (α) before and after normalization. (E,F) distributions of mean fluorescence intensity (f) before and after normalization.