 | Acta Crystallographica Section D Acta Crystallographica Section D BIOLOGICAL CRYSTALLOGRAPHY |
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![[Figure 4]](ba5023fig4mag.jpg)
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Figure 4
(a) Any line perpendicular to the tangent of a circle passes through the centre of a circle. For the roughly circular object shown in (b), lines in the direction of the steepest gradient do not cross at a single point, but the crossing points can be used to estimate the centre and provide a measure of circularity. |
![[Figure 4]](ba5023fig4.jpg)
| BIOLOGICAL CRYSTALLOGRAPHY |
ISSN: 1399-0047
