Long description: figure1a
Alt text: Three overlapping ellipses labeled A, B, and C are positioned on a plain background.
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- The image displays three separate, shaded ellipses labeled A, B, and C.
- Ellipse A is situated in the upper left portion of the frame and does not overlap with any other labeled shape.
- Ellipse B is located in the upper right portion of the frame.
- Ellipse C is positioned in the lower center of the frame and overlaps partially with a fourth, unlabeled ellipse labeled D.