Folded light curve of the Crab pulsar as a function of phase for Aqueye observation 4 in Table 1. The folding period and the bin time are 0.0336216417 s and 33.6   μs, respectively. The typical double peak profile of the pulse is recognizable. For clarity two rotations of the neutron star are shown. Phase zero/one corresponds to the position of the main peak in the radio band and is marked with a vertical dashed line.