Explanations

left top: value of characteristic number for a single event.
left bottom: mean value of the characteristic number within the period of data analysis.
right top: maximum value of the characteristic number within the period of data analysis.
right bottom: minimum value of the characteristic number within the period of data analysis.

Examples

mean flood current:mean ebb current	mean flood current:mean ebb current (maximum)
ratio of mean flood current:mean ebb current of one specific tide	maximum value of ratio of mean flood current:mean ebb current within the period of data analysis

mean flood current:mean ebb current (mean value)	mean flood current:mean ebb current (minimum)
mean value of ratio of mean flood current:mean ebb current within the period of data analysis	minimum value of ratio of mean flood current:mean ebb current within the period of data analysis