Referring to the figure, find the value of 
. 
Definitions:
Bundle of His
A group of specialized heart muscle cells that are designed for electrical signaling, responsible for carrying impulses from the AV node to the heart's ventricles.
Pulmonic Valve
The heart valve that separates the right ventricle from the pulmonary artery and regulates blood flow to the lungs.
Aortic Valve
A heart valve located between the left ventricle and the aorta that regulates blood flow from the heart into the aorta.
Base of Heart
The upper portion of the heart, including parts of the atria and the large vessels that lie at the heart's base.
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