Thanks. I get it now. It's a way of moving the side tie-out points away from the ends so they line up better with the hammock tie-out points. I have accomplished something similar by changing the propotion of length to width of the tarp. I actually shortened the tarp to 8' 6" to make the tieout point line up with the hammock better, thus achieving marginally better coverage by making the tarp smaller.
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