The RS is computed on an ensemble of 192 points starting retrospectively at two days before the election day.

Every point corresponds to one hour, so that the whole period analyzed goes from 10 days before the elections to 2 days before the election. We keep the list of ratios the same as in the main paper, reflecting the strength of parties at a national level, despite the fact that some of these ratios are now different. “Ratio” represents the ratio of votes obtained by the two parties in the first column, i.e. votes(A)/votes(B). Even the numerical agreement with the ratio in terms of votes seems rather good. Only the cells whose font is bond present deviations from expected.