If you zoom in and take a look around, you can see how tessera is broken up by fractures and/or folds -- multiple generations of them, criscrossing each other willy-nilly. At its edges, you can see how the darker (hence, smoother) plains lavas lapped up onto the tessera, making it look in some places almost like the lavas dissolved the tessera away.

You might predict that the remaining tessera stand high, and the lava plains low. When you look at the data, though, the actual story of the topography isn't that simple. Magellan did return topographic data, but its resolution is nowhere near the resolution of the radar images. Here's what the topographic data look like for exactly the same region. Dark is low, bright is high. Each of those little parallelograms is a pixel in the global digital elevation model for Venus. And each of those pixels is actually substantially smaller than the footprint of Magellan's altimeter. It actually sampled an area about 2 by 3 or 4 pixels in size each time it bounced a radar signal off the surface to measure the range.