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. Fig, Time-resolved differential absorbance signal measured in RC. The horizontal axis is linear in the time interval [?20 ps, 40 ps] and logarithmic in the time interval [40 ps, 196 ns] Blue dots correspond to the data averaged in time bins of width 700 fs in the linear part of the plot and of increasing size in the logarithmic part of the plot, hence the improvement in signal-to-noise ratio with increasing time delay. The solid line shows a fit, with an exponential rising time of 3.7 ps and a three-exponential decay with 2, 42%), and 43 ns (5%) time constants, pp.0-53