GGU-TIME-GRAPH: "Modify hydrograph" button

You can edit all data for the current point using a constant. For example, assume that all groundwater levels were given with an error of one metre; by adding a "Constant 1.00" all measured data can be corrected.

The four basic mathematical operations can be used. Additionally, the modifications can be limited to certain measured data ranges by activating the "Modify measured data from Date (1) to Date (2)" check box.