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Frequency-resolved optical gating for the complete reconstruction of attosecond bursts (FROG-CRA is a well-known technique for the complete temporal characterization of ultrashort extreme ultraviolet (XUV) pulses, with durations down to a few tens of attoseconds. Recently, this technique was extended to few-femtosecond XUV pulses, produced by high-order harmonic generation (HHG) in gases, thanks to the implementation of a robust iterative algorithm the extended ptychographic iterative engine (ePIE). We demonstrate, by using numerical s