O−C diagrams for eleven PCEBs according to ephemerides given in text, including previously published eclipse timings (black squares) and new binned SuperWASP timings (red crosses). The x axes indicate cycle count; the y axes O−C values in seconds. For HW Vir, the region containing new SuperWASP values is surrounded by a red rectangle for clarity. For HS 2231+2441, larger black squares indicate the approximate locations of the unpublished observations of Qian et al. (2010b), with their fitted curve overplotted as a solid line.