While Figure presents the reflected signal at a few selected moments of growth 1, the 2D map in Figure shows the time scan (y-axis) of the scattering on the detector (x-axis) during the whole duration of growth 1 from bare liquid copper (areas of higher intensity) to the complete layer of graphene. The upper limit of the time resolution is defined by the detector readout frame rate (280 Hz for Maxipix, in our case). The image visualizes the movement and growth of the graphene crystals (areas of lower intensity), which ~27 min after the introduction of CH4 flow, occupy the entire surface under the beam. Information about the graphene crystals' size, inter-flake distances, and kinetics can be extracted since the distances in pixels on the detector can be correlated with real-space objects on the sample surface. For example, the length S of the beam footprint on the curved sample at αi can be found as: