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

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

flood period : tide period (mean value)	flood period : tide period (minimum)
mean value (weighted) of ratio of flood period : tide period within the period of data analysis	minimum value of ratio of flood period : tide period within the period of data analysis