The gyration radius is useful in estimating the stiffness of a column. GPC separates based on the size or hydrodynamic volume (radius of gyration) of the analytes. A value greater than 1 indicates an increased radius of gyration due to branching. With formula 16 being the polymer's radius of gyration. The radius of gyration is generally larger than that of the ideal chain. It is often similar in magnitude to the radius of gyration. These diagonal elements are called the principal moments of the gyration tensor. The direction of g is called the axis of gyration of the material. Cyclic symmetries n are labeled as g for their central gyration orders. Cyclic symmetries in the middle column are labeled as g for their central gyration orders. This turns the magnetic particles at an angle to the ambient field, resulting in gyration. In analysis of the fetal brain, MRI provides more information about gyration than ultrasound. The intersection of these circles meet at order 2 and 3 gyration points.