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Just guessing here, but I think the vertical scaling might be for translating some of the top-down images they have. If you take a look at the photo below, Pluto appears to have pretty rough terrain. I didn't find anything about post-processing for this particular image, sorry in advance if I missed it.

https://photojournal.jpl.nasa.gov/catalog/PIA19947

Pluto has some mean mountains. Think low gravity and no erosion.

> With peaks reaching 6.2 km (3.9 mi; 20,000 ft) in height, they are the highest mountain range on Pluto, and also the steepest, with a mean slope of 19.2 degrees.

https://en.wikipedia.org/wiki/Tenzing_Montes

Thanks, those very, very big mountains made no sense to me. The radius of Pluto is more than 1000 km