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After reading ref. 1 we became aware of a mistake in this Letter. The last sentence of the legend of Fig. 1b should have read: “The delay of the second harmonic is defined in cycles of the second harmonic.”. As a result, the even harmonics modulate twice per cycle of the second harmonic in Figs 1b, 3 and Extended Data Fig. 3, rather than once as stated. Two modulations per cycle are indeed expected for our experiment in ZnO, and have also been measured in gases.
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