period results for test signal (cos(0.6x) + noise):
nout,jmax,prob=180 38   3.6528e-05
33     0.523599     0.260916
34     0.539465     0.121429
35     0.555332     2.016269
36     0.571199     7.206184
37     0.587065    13.069689
38     0.602932    14.717242
39     0.618799    10.877194
40     0.634665     4.613147
41     0.650532     0.869294
42     0.666399     0.962119
43     0.682265     2.122025