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Figure 3
The two-dimensional density map for the tri-β-peptide generated (a) using all 52 hk0 reflections and the phases from the best SayPerm phase set, and (b) using just the seven strongest low-order reflections (see Table 2[link]). The more positive regions of the maps, where atoms would be expected, have been shaded in gray. Zero (dotted) and higher level contours are also shown in (a). Note that the form of the molecule cannot be discerned in (a), but is readily apparent in (b). The final structure is overlaid in (b) for comparison.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 35| Part 2| March 2002| Pages 243-252
doi:10.1107/S0021889802001759
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