Amount of DE at early times Ω_e as a function of the redshift z_e after which early DE is non-negligible (see Eq. (27), Sect. 5.1.5) for different combinations of data sets. The heights of the columns give the limit at 95% CL on Ω_e, as obtained from Monte Carlo runs for the values z_e = 10, 50, 200 and 1000. The width of the columns has no physical meaning and is just due to plotting purposes. Here Planck indicates Planck TT+lowP.