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Table 1.
Number of total (B) and polarized (pB) brightness images used in this work.
| May 2001 | June 2001 | March 2008 | April 2008 | |
|---|---|---|---|---|
| B | 192 | 176 | 168 | 210 |
| pB | 96 | 88 | 85 | 105 |
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