| 3C273-20210430-S001-R001-B-001643.fts |
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| Only less than 50 stars was detected |
| 3C273-20210430-S001-R001-I-002034.fts |
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| Only less than 50 stars was detected |
| 3C273-20210430-S001-R001-R-001917.fts |
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| Only less than 50 stars was detected |
| 3C273-20210430-S001-R001-V-001801.fts |
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| Only less than 50 stars was detected |