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| VERITAS 2008 - 2009 monitoring of the variable gamma-ray source M87 | 304 |
| December 2012 | January 2013 | February 2013 | March 2013 | April 2013 | May 2013 | June 2013 | |
| VERITAS 2008 - 2009 monitoring of the variable gamma-ray source M87 | 20 | 22 | 18 | 10 | 16 | 47 | 15 |
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