Can someone offer a simple explanation of how the pressure curve works.  I 
have managed to get values I like, but I can't for the life of me figure out 
how those relate to the real world.

given
xsetwacom set stylus0 PressCurve $x $y $z $w
How do we draw the curve?

Is my horrible ASCII representation below even remotely correct?
'xsetwacom list param' mentions a bezier curve where I've drawn straight lines 
to avoid attaching an image, but am I even close to the right idea?

  pressure reported to X
       ^
       |       (z,w)/--(100,100)
       |           /
       |          /
       |         /
       |        /
       |       /
       |      /
       |     /
       |    /
 (0,0) |---/(x,y)
       |----------------> pen pressure

--Thomas

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