[vtkusers] What does the coeff mean????

[Shiva Bissoon]

Hi all,
I was working on using this quadratic equation to create an ellipse and I 
wanted to change the ellipse in terms of x, y and z dimensions.

The code
  vtkQuadric quadric
     quadric SetCoefficients .5 1 .2 0 .1 0 0 .2 0 0

Does anyone know what the coefficients represent????
Is it max and min of x,y,z...why are there 10 coefficents???

Any help ...
ASAP please
thanks,
Shiva
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