Elliptic Function
H(s) for n=4, r
p
=3, r
s
=50
H(s) = (0.0032s
4
+ 0.0595s
2
+ 0.1554)/( s
4
+ 0.5769s
3
+ 1.2227s
2
+ 0.4369s + 0.2195)