Figure 7.

Geometry used for characterizing statolith velocity and channeling behavior. A, Coordinate system used for amyloplast sedimentation analysis. The y axis is parallel to the gravity vector. The x axis, chosen to parallel the side of the columella cell opposite and perpendicular to the gravity vector, creates a right-handed coordinate system with the z axis (not shown) into the columella cells. By drawing the coordinate system tangent with the outermost cell wall of the columella cell, the coordinate axes approximate the upper and distal boundaries of the simplified rectangular cell. B, Geometry used to compute the CC in Equation 3 with the cell divided into nine segments and each statolith identified by a subscript.