Figure 1. In situ position of crystalline lenses on a Cartesian coordinate system

A: Schematic computer assisted drawing (CAD) showing the Cartesian coordinate system on which the scale CADs of lenses are oriented. B: The in situ orientation of lenses in reference to the x, y, and z coordinates. C: The assignment of degrees latitude and longitude to lenses in the in situ position. Utilizing degrees of latitude and longitude not only facilitates an understanding of a fiber's position within a growth shell, but they also make possible more accurate estimates of fiber length.