Left panel: synthetic image of a moving source of increasing flux. The red dots denote the pixel locations of the measurements. Middle panel: the initial choice for the source flux over time (black squares) and the estimates from the least-squares fit (red squares). Right panel: the synthetic signal along the central pixel row of the meteor (black curve) and the reconstructed values from the A_k estimates (red diamonds). The value of the goodness-of-fit quantity is indicated in the upper left while the grey error bars represent 1σ formal uncertainties.