Based on the following scatter plot, which of the time-series components is not present in this quarterly time series? 
Definitions:
Coupon Bond
A type of bond that pays the holder a fixed interest payment (coupon) at regular intervals until the bond reaches its maturity date.
Maturity
The date on which the principal amount of a bond, loan, or other financial instrument is due to be paid back to the investors.
Interest Rates
The cost of borrowing money or the reward for saving, typically expressed as a percentage of the principal.
Premium
The amount by which the price of a financial instrument or insurance policy exceeds its face value or the cost above the normal price.
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