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The annualized roll-down return difference is the 2.75% corporate bond realized return less the 1.80% UK gilt realized return, or 0.95%. roll-down return为什么包含counpon rate?The interpolated benchmark involves the use of the most liquid, on-the-run government bonds to derive a hypothetical 10-year UK gilt YTM. Because the UK gilt yield curve is upward sloping in this example, we can conclude that the relative roll-down return using an interpolated benchmark would be lower than the 0.95% difference in Question 1.可以理解，UK gilt yield curve is upward sloping ，所以10-year UK gilt YTM