The following structure represents a butyl group. 
Definitions:
Yield To Maturity
The total return anticipated on a bond if the bond is held until it matures, including all interest payments and the repayment of principal.
Modified Duration
Macaulay’s duration divided by 1 + yield to maturity. Measures interest rate sensitivity of bonds.
Macaulay Duration
A measure of the weighted average time until all cash flows from a bond are received, used to gauge a bond's interest rate sensitivity.
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