Quiver Plot Demo - Circular Flow
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| 1.0                                                                            |
| *                                                                              |
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| 0.8            \                                   ^                           |
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| *                                                                              |
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| 0.6                                                                            |
| *                                                                              |
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| 0.4                                                                            |
| *              <                                   \                           |
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| 0.2                                                                            |
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| *              *              *               *              *               * |
|0.0            0.2             0.4             0.6             0.8          1.0 |
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