.030 = 24 sec
.040 = 22 sec
.050 = 20 sec
.060 = 18 sec
.070 = 16 sec
.080 = 14 sec
.090 = 12 sec
.100 = 10 sec

double digit  spectral is signifcant not artifact
 

EXAMPLE;

YYYY MM DD hh Sep_Freq  < spec_1 (freq_1) spec_2 (freq_2) spec_3 (freq_3) ... >
2004 01 31 07 0.125 0.000 (0.030) 0.000 (0.040) 0.000 (0.050) 0.000 (0.060) 0.454