| 3C273-20210421-S001-R001-B-224248.fts |
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| Only less than 50 stars was detected |
| 3C273-20210421-S001-R001-I-224635.fts |
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| Only less than 50 stars was detected |
| 3C273-20210421-S001-R001-R-224520.fts |
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| Only less than 50 stars was detected |
| 3C273-20210421-S001-R001-V-224405.fts |
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| Only less than 50 stars was detected |