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Table 1.
Summary of photometric observations.
| Band/database | N |  |
 |
Mag |
|---|---|---|---|---|
| I/OGLE-II | 346 | 551.77073 | 1858.52147 | 13.213 |
| I/OGLE-III | 795 | 2117.76494 | 4955.73490 | 13.221 |
| I/OGLE-IV | 1465 | 5261.84891 | 7332.50545 | 13.213 |
| V/OGLE-IV | 118 | 5274.88451 | 7273.60682 | 15.038 |
Notes. The number of measurements, start and end times, and average magnitude are given. HJD′ = HJD-2450000. The uncertainty of a single measurement varies between 4 and 6 mmag.
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