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![[Figure 2]](rr5252fig2mag.jpg)
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Figure 2
Graphical representation of the spatial density-based clustering results produced by OPTICS (Ankerst et al., 1999  ). Data points are represented as black dots, with circles of different colours (A, B, C and D) representing clusters. By not including a global density requirement, clusters of different spatial densities can be automatically separated (A, B, C and D), whereas a global density requirement would either join C and D together or omit A and B entirely. The same concept applies in higher dimensions. |
![[Figure 2]](rr5252fig2.jpg)
 | STRUCTURAL BIOLOGY |
ISSN: 2059-7983
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