Fig. 4. Temporal changes in soil moisture over 10 day period at 5-, 10-, and 15-cm depth for each treatment during experiment 2. A trend line was fitted for each treatment and depth with slope and intercept displayed.

Image from Applied Turfgrass Science article:
Irrigation Scheduling on Sand-Based Creeping Bentgrass: Evaluating Evapotranspiration Estimation, Capacitance Sensors, and Deficit Irrigation in the Upper Midwest