Strayos cut fill analysis tool allows you to add cut-off values for cut and fill visualization. It is the elevation difference between the surfaces being compared.
The color corresponding to the cut or fill value indicates that the area visualized by the color on the map has an elevation difference is equal to or greater than the value and less than the next higher value (or infinity if next higher value is not present) on the slider.
The upper and lower limit for the cut-off are calculated by the tool and cut and fill value cut-offs are limited by these values. For example (refer screenshot below), the area with color Red on the map has elevation difference of -6m to -3m while the one with color yellow has elevation difference of -1m to 5.6m.