Explanations

Mean value of salinity during the ebb current duration of a tide.

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

mean salinity ebb current (mean)	mean salinity ebb current (minimum)
mean value of mean salinity of ebb current within the period of data analysis	minimum value of mean salinity of ebb current within the period of data analysis