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f/ i» the fraction of time the ship will operate at a given speed for a given sea state and includes ell headings relative to the predominant wave direction. 



f^ la the fraction of time that a given sea state will be expected, on the average. 



/ iB the fraction of time the ship wilt make a given heading to the sea, for s given sea state and speed. 



/V is the number of variations expected per hour of operation under the condition considered. This value of N is taken from the tables of basic data. 



ttThe exponents in columns 10-18 denote the power of 10 by which the given number is to be multiplied. 



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