X-ray diffraction patterns of examples of all monoformat isoforms, displaced vertically to separate them. The seven vertical solid lines are at 2θ values calculated (Bragg's law) from the dobs spacings of the monohydrate inulin crystal reported by André, Putaux et al. (1996, Table 4: hkl designations 101, 111/201, 202/112, 020/310, 311/021, 400/220, and 222/402, of which six values are composites of more than one diffraction peak). The peak at ∼25.5°2θ is taken to be a composite of dobs spacings 400/220, and 221/411 (dashed lines) from electron diffraction data in Table 3 of that paper.