| 3C273-20210419-S001-R001-B-223854.fts |
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| Only less than 50 stars was detected |
| 3C273-20210419-S001-R001-I-224243.fts |
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| Only less than 50 stars was detected |
| 3C273-20210419-S001-R001-R-224128.fts |
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| Only less than 50 stars was detected |
| 3C273-20210419-S001-R001-V-224012.fts |
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| Only less than 50 stars was detected |