2   5  7   11         21        31
    - --- -- ---- ---------- --------- --------- --------- ---------
   |X|   |  |PSMZ|XXXXXXXXXX|         |         |         |         |
    - --- -- ---- ---------- --------- --------- --------- ---------
       |  |   |                 |         |          |         |
       |  |   |                 |         |          |         |
       |  |   |                 |         |          |     (4)Zero Crossing Period (F10.0)
       |  |   |                 |         |          |
       |  |   |                 |         |          |
       |  |   |                 |         |          |_(3)Significant Wave Height(F10.0)
       |  |   |                 |         |
       |  |   |                 |         |
       |  |   |                 |         |_(2)Finish Frequency(F10.0)
       |  |   |                 |
       |  |   |                 |_(1)Start Frequency(F10.0)
       |  |   |
       |  |   |_Compulsory Data Record Keyword(A4)
       |  |
       |  |_Optional User Identifier(A2)
       |
       |_Compulsory END on last data record in data category(A3)

(1)-(2) Start/Finish Frequency - The lowest/highest frequency at which the spectrum is defined. The program will assume that the frequencies are in radians/sec, unless a HRTZ data record (see The HRTZ Data Record - Change Units of Frequency to Hertz) has been used to change this to Hertz (cycles/sec).

If these fields are left blank, defaults will be assumed as follows:

Start frequency = Peak frequency * 0.58

Finish frequency is evaluated numerically so that approximately 99% of the spectral energy is included.

(3)-(4) The average (i.e. mean zero-crossing) wave period and the significant wave height are the parameters used by Aqwa to describe the Pierson-Moskowitz wave spectrum, the special case for a fully developed sea.