The autocorrelation function (ACF) of the spatial series of transcript abundances. (a) ACF of the series recorded in LB medium. (b) ACF of the series after scrambling the linear order of genes. The dotted line delimits the 95% confidence band. (c) The robustness of autocorrelations in the series recorded in LB as determined by bootstrapping. The robustness is expressed as a percentage of times the autocorrelation at the corresponding lag satisfied the critical value threshold (α = 0.05) following bootstrapping of the observed relative abundances. The sampling was done 1,000 times.