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Table 1
Values of parameters, r1,r2,r3, and r4 used for the limb brightness correction formula, expressed as percentage of the solar radius.
| Instrument | r 1 | r 2 | r 3 | r 4 |
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| EIT | 80 | 95 | 107 | 112 |
| EUVI | 70 | 95 | 108 | 112 |
| SWAP | 95 | 100 | 105 | 115 |
| AIA | 70 | 95 | 108 | 112 |
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