The XC90 I’m thinking of buying has a weird sort of roof panel just ahead of the rear spoiler on the roof. Why is it designed that way? Only thing I could think of is a non-metal panel for antennae or something.

To be a little more descriptive, the front-to-back ridges are the normal metal roof. But then there’s about 20” of flat panel before you get to the rear hatch.

What’s up with it??