| 3C273-20210418-S001-R001-B-231104.fts |
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| Only less than 50 stars was detected |
| 3C273-20210418-S001-R001-I-231453.fts |
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| Only less than 50 stars was detected |
| 3C273-20210418-S001-R001-R-231337.fts |
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| Only less than 50 stars was detected |
| 3C273-20210418-S001-R001-V-231221.fts |
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| Only less than 50 stars was detected |