Results of the fit of the y profile extracted from three cluster sectors with a simple power law. Left panel: sector with the same angular size and extension as the west shock but pointing to the north, where there are no visible shock features. Middle panel: profile of the west shock. Right panel: profile of the south-east shock. In the lower panel of each figure we report the ratio between the observed and the best-fit model of the projected y profile in units of the relative error. The figure clearly illustrates that while the power law gives a good fit for the north sector where no shock is present, it returns a poor fit in the west and south-east sectors. These two cluster regions require a discontinuity in the pressure jump, as shown in Fig. 6.