Position A corresponds to 62 °N, 33 °W. 



Position I corresponds to 59 °N, 19 °W. 



Position J corresponds to BZ.B'N, 20°W. 



Position K corresponds to 45 °N, 16 °W. 

 If the record was not 15 minutes long, less than 600 points were 

 read. For these records, Table 4 gives the actual number of points 

 used and the corrected total degrees of freedom. A correction to the 

 upper and lower confidence limits, which would be quite small, would 

 also be needed to be exact. 



Spectra l tabulations 



A tabulated spectrum can be interpreted as follows: 



la) Supplementary data for each spectrum consist of the date, 

 hour, wind speed, total degrees of freedom, average 

 period, significant height, corrected variance, noise 

 level, and record number. Some tables give the confi- 

 dence limits for the height according to equation (7). 



lb) In the first column, the spectral lag numbers (H) are given. 



2) In the second column (FRE) the frequency according to the 



equation f = H/ 1 80 (sec ) is given. 



2 



3) In the third column (UNIT = FT ), the spectrum as com- 



2 

 puted from the original data is given in units of (ft) . 



4) In the fourth column (FILTERED), a smoothing operator 



for H > 40 is applied. It is actually 



^H=0'25U^-1^0-50Uh + 0.25F^^^ 

 (where F = Filtered, and U = Unit) 



5) In the fifth column (LESS NOISE), the noise level shown at 



the top is subtracted from each estimate. 



