
Figure 8
(a>) Dendrogram for cluster analysis of the 22 cryocooled memPROT data sets introduced in §3.5. (b) Spread of R_{meas} values for random combinations of 2, 3, 4, ..., 21, 22 data sets (§3.5). The broken line joins the medians for all cases. Full lines join the interquartile range points for all cases. The empty circles represent R_{meas} for all merged data sets found in the dendrogram in (a). Among all data sets with an R_{meas} of <0.15 and a completeness of >90%, only three turn out to be useful for structure solution: those corresponding to clusters 9, 15 and 18. (c) Height of peaks for the strongest 20 peaks in the anomalous Fourier for the three single data sets A34, A45 and yu60, the three combined data sets corresponding to cluster 9, the two combined data sets corresponding to crystals M1S3 and M1S14, and for all data sets combined together. The anomalous maps calculated from clusters 15 and 18 clearly show higher peaks than those calculated from data set A34. The anomalous signal provided by the combined data set M1S14 (see §3.5) is even higher. The highest signal, as one would expect, comes from the case where all data sets are merged together, because of the good degree of isomorphism and the relatively low resolution of the data involved. The number of anomalous scatterers in the asymmetric unit (the portion of the Fourier transform shown here) is 12. 