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It's a logarithmic spiral so I'm assuming the eqn in polar co-ords should be;

r(theta)=a*exp(b*theta)

parametrically it should be;

x=r*cos(theta)=a*cos(theta)*exp(b*theta)

y=r*sin(theta)=a*sin(theta)*exp(b*theta)

and in cartesian co-ords;

x^2+y^2=exp((theta)*cot(a))

Any advice on SigmaPlot or plotting spirals in general will be greatly appreciated!