Text Appendix C 



6 Mean direction 



First quartile direction of cumulative distribution 



function 



5O% Median direction of cumulative distribution func- 



tion 



75% Third quartile direction of cumulative distribution 



function 



; / * discrete direction 



m m '* direction of a set of M discrete directions 



Direction of minimum energy 



Peak direction 



p 



X (f , ) IMLE correction factor at the r* iteration 



a Circular width parameter 



4> ..(/ ) Cross-spectral phase between gauges /' and; at 



frequency f 



E6 



Appendix E Notation 



