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Micro- and macroscopic aspects of HHG. (a) Energy-time structure of classical trajectories in HHG. Birth times and corresponding recollision are in blue, recollision times and energies are in red. Arrows link the corresponding birth and return times for the short and long trajectories. (b) Experimental SXR HHG spectrum as a function of He backing pressure, showing spectral shaping as macroscopic parameters are changed. (Online version in colour.)
