  Generalizing methods developed by Pinn, Pordt and Wieczerkowski for the
hierarchical model with one component (N=1) and dimensions d between 2 and 4 we
compute O(N)-symmetric fixed points of the hierarchical renormalization group
equation for some N and d with 0 < d < 4 and -2 <= N <= 20. The spectra of the
linearized RG equation at the fixed points are calculated and the critical
exponents \nu are extracted from the spectrum and compared to
Borel-Pade-resummed \epsilon-expansion.
