Greetings to one and all. Just getting started w/ Part II prep, so please excuse the elementary nature of my question. 
Can someone kindly explain the calculations of the "Perturbed Spot" rates and "Discount Factor" in the table at bottom of page 144 in Tuckman's assigned reading?
Many thanks!

Can someone kindly explain the calculations of the "Perturbed Spot" rates and "Discount Factor" in the table at bottom of page 144 in Tuckman's assigned reading?
Many thanks!