Wow, that chart is simultaneously super useful and absolutely maddening. First off, visualization 101: an angry red color should correspond to BAD, not good. And it would be helpful if the dark versions of the colors were in the middle so that brightness indicated extremity. But that's all trivial compared to the axes. Why on earth is the Y axis a function of the X axis??? It makes the spatial layout practically uninterpretable. Why not just snaps vs pressures?