Long description: figure5
Alt text: Two circles are shown side-by-side, with the first circle having an arrow pointing upwards, and the second circle having an arc labeled θ with an arrow pointing upwards.
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- The image displays two distinct circular diagrams arranged horizontally.
- The circle on the left is a plain circle with a single arrow originating near the center and pointing vertically upward.
- The circle on the right is also a plain circle, but it features an arc defined at the top, indicating an angle labeled θ (theta). An arrow is positioned along this arc, pointing upward.