D_min / D_max (dynamic D)
D_min and D_max let Betaflight vary the D term dynamically: low during calm flight for less noise and cooler motors, higher during fast moves for more damping.
Too-low D_min can allow propwash and ringing; too-high D_max heats the motors when noise is present. PIDoctor looks at overshoot and noise together and can flag whether your D range matches your tracking.