| 3C273-20210220-S001-R001-B-021327.fts |
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| Only less than 50 stars was detected |
| 3C273-20210220-S001-R001-I-021720.fts |
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| Only less than 50 stars was detected |
| 3C273-20210220-S001-R001-R-021603.fts |
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| Only less than 50 stars was detected |
| 3C273-20210220-S001-R001-V-021447.fts |
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| Only less than 50 stars was detected |