Smoothed ROSAT image of Abell 3527-bis. Over-plotted is the contour of the radio emission at 327 MHz, same contour level as in Fig. 1b. No counter-relic is detected. The direction of the position of the nearby cluster Abell 3527 is labelled. Abell 3527 is 20′ (4 Mpc at z = 0.2) away from Abell 3527-bis. White × show the position of optically-identified cluster members. The dashed line shows the field of view of the optical observation.