For cover details see the papers by Kodi and Louri, pp. E13-E23; Gao and Wagner, pp. E1-E12, Chattopadhyay et al., pp. E35-E44; and Siegmann et al., pp. E24-E34. The figure at bottom right is from an OHPC feature paper in the 1 August issue of JOSA A; see the paper by Tamir et al., pp. A11-A20."