Rotational phase plot for each observation. Like a dial in a meter, each line represents the rotational phase of the asteroid at the time of each observation (see Table 1 for the epoch of the observations). The grey dials correspond to observations in the NIR, while black ones to observations in the VIS. The width of the bars is related to the accuracy of the knowledge of the phase due to the propagation of the uncertainty in the rotational period. The phase is arbitrarily set to zero at the epoch of the first observation.