| 21. | Later observations with the Hubble telescope brought much clearer images and the first direct measurements.
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| 22. | Making direct measurements of the mass balance is simple.
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| 23. | This allows direct measurement of the geoid, since the ocean surface closely follows the geoid.
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| 24. | Direct measurements for k and k are not available.
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| 25. | The constants are expressed in direct measurements and fixed constants to minimize and determine the uncertainty.
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| 26. | It allows direct measurement of the azimuth from any point on the map to the center.
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| 27. | Only when there is a concern for a specific problem will a direct measurement be made.
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| 28. | :( ec ) These are not direct measurements.
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| 29. | Indirect evidence exists on acoustic and radio frequencies; however, direct measurement of field quantities is missing.
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| 30. | Direct measurements are simple, but very difficult.
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