Representative phase plots for 25 cells stimulated with D1=10, 1, 0.1 ng/ml TNF-α (out of 151, 77, 123 cells analysed, respectively) D2=0 ng/ml for (A) Tf =180 min with T1= 30 min and (B) Tf =45 min with T1=22.5 min (analysed 101, 112, 119 cells). (C, D) Plots showing the distributions of the periods for the conditions given in panels (A) and (B), respectively. (E, F) Average peaks height in the intervals [(n–1) T0, T0) and [(n–1) T0/2, nT0/2), for A and B, respectively. In (E), even n correspond to peaks right after stimulation, odd n correspond to the small peak arising between two consecutive stimulations. (G, H) Distribution of the phase difference Δϕ for the forcings in A and B: Δϕ has narrower distributions for higher doses. (I) The synchrony intensity η grows with the doses for Tf=180 min (blue) and Tf=45 min (red). (J, K) Synchrony intensity plots show that ηn does not increase as successive cycles of forcing are applied to the system, both for Tf=180 min and Tf=45 min, respectively. All the analyses included all the tracked cells with no preselection of the responding ones. Figure supplements 1 to 3 are provided.