| 3C273-20190616-S001-R001-B-221625.fts |
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| Only less than 50 stars was detected |
| 3C273-20190616-S001-R001-I-222011.fts |
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| Only less than 50 stars was detected |
| 3C273-20190616-S001-R001-R-221856.fts |
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| Only less than 50 stars was detected |
| 3C273-20190616-S001-R001-V-221741.fts |
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| Only less than 50 stars was detected |