What kind of files can I get out of a Ricoh Theta S?

When shooting full sphere panoramic photos with the Ricoh Theta S, what kind of files can I get out of it? Is it possible to get the two files before stitching? Or do I always get the final product? And in which format/projection is the final product saved, is the original sensor image heavily distorted or is it close to the sensor data? I ask on one hand because I am worried about the image quality of the final rendered images and, on the other hand, I am working exclusively on linux, so I cannot use “their” apps but need suitable input data for Hugin.

A link to some example files would be great. Unfortunately, I was not able to find such examples nor did I find answers to my questions, not even in the original manual.