 | Acta Crystallographica Section F Acta Crystallographica Section F STRUCTURAL BIOLOGY COMMUNICATIONS |
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![[Figure 4]](wd5176fig4mag.jpg)
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Figure 4
Diederichs plots for 1fm4 and 3k78 . The left panel depicts the graph of I/σ(I) versus log(I) for each unique reflection in the 1fm4 data set. It can be clearly seen that the sigmoid shape of the distribution levels off at around 20 to 30 I/σ(I), as established and expected for normal data sets (Diederichs, 2010  ). In contrast, data for 3k78
show a steady increase to improbable I/σ(I) values, indicating that they are not influenced by or do not contain any instrumentation-related measurement errors. The dashed boxes show how the 1fm4
graphs would scale into the 3k78
plots. The insert includes the extreme values for 3k78
which are omitted in the main panel. Note that the original Diederichs plots are based on unmerged intensities (which are not available, but redundancies are comparable between 1fm4
and 3k78
). Merged reflections will have I/σ(I) values higher by approximately the square root of the redundancy (K. Diederichs, personal communication). |
![[Figure 4]](wd5176fig4.jpg)
| STRUCTURAL BIOLOGY COMMUNICATIONS |
ISSN: 2053-230X
