code: def hyperbola_values(hyp_axes, xvals):
      
      A = N.sqrt(hyp_axes)
      return A[1]*N.cosh(N.arcsinh(xvals/A[0]))
docs: kwargs:
          transformation  rotation to apply to quadric prior to slicing
                          (e.g. transformation into 'world' coordinates
          axes            axes on which to slice the data