17.4. The HRTZ Data Record - Change Units of Frequency to Hertz

      2   5  7
    - --- -- ----
   |X|   |  |HRTZ|
    - --- -- ----
       |  |   |
       |  |   |_Compulsory Data Record Keyword(A4)
       |  |
       |  |_Optional User Identifier(A2)
       |
       |_Compulsory END on last data record in data category(A3)

This data record acts as a switch which changes the units for all following frequencies input to hertz in wave spectra definitions.

If omitted, the program will expect all frequencies to be input in radians/second.