Table 2. Quantitive Analysis on the Twist Motion of the A-C Linker.

A. Measurement of Twist Angle at A-C Linker
Class	θ angle (degree)
I	93
II	90
III	87
IV	83

B. Measurement of Twist Angle at A-C Linker
Class	θ angle (degree)
I	96
II	93
III	90
IV	89
V	84
VI	80

A. The assignment for each class is following convention defined in Figure 4D and it is based on the resulting four classes in the first classification scheme, illustrated in Figure 3—figure supplement 1. In the scheme, the A-tubule is used as a reference point. The angle θ is defined as the angle between the Arm A and the Leg B as illustrated in Figure 4A.

B, The assignment for each class is following convention defined in Figure 4E and it is based on the resulting six classes in the second classification scheme, illustrated in Figure 3—figure supplement 4. In the scheme, the C-tubule is used as a reference point.

In both A and B, the angle θ is defined as the angle between the Arm A and the Leg B as illustrated in Figure 4A.