  The recently developed quantum surface of section method is applied to a
search for extremely high-lying energy levels in a simple but generic
Hamiltonian system between integrability and chaos, namely the semiseparable
2-dim oscillator. Using the stretch of 13,445 consecutive levels with the
sequential number around $1.8\cdot 10^7$ (eighteen million) we have clearly
demonstrated the validity of the semiclassical Berry-Robnik level spacing
distribution while at 1000 times smaller sequential quantum numbers we find the
very persistent quasi universal phenomenon of power-law level repulsion which
is globally very well described by the Brody distribution.
