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

maximum ebb current:mean tide current	maximum ebb current:mean tide current (maximum)

maximum ebb current:mean tide current (mean value)	maximum ebb current:mean tide current (minimum)