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Eraser Tool Options gives Angle, Roundness and Size each a variation menu (Fixed, Random, Pressure, Tilt, Bearing, Rotation) and a Variation field. path.eraseRegion takes angleMode, roundnessMode and sizeMode with their variations, sweeps a varying tip as a Calligraphic nib with what the pen read along the drag, and refuses an unknown mode or a variation out of range. The Eraser records the pen's pressure, tilt and rotation when a mode follows them, and its tip outline at the pointer takes the angle, roundness and size the pen gives while it erases.