(a)–(d) Two-dimensional slices of the reciprocal lattice of ITQ-51 reconstructed from three-dimensional RED data. (a)–(c) Two-dimensional slices from data set 1. The crystal is shown as an inset in (c). (d) A two-dimensional (h0l) slice from data set 2, showing that the two data sets cover different parts of reciprocal space. (e) A structural model for ITQ-51, viewed along the c axis. Reprinted (adapted) with permission from Martínez-Franco et al. (2013). Copyright (2013) the National Academy of Sciences, USA.