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Observ.         Number                       Site of                                              Download    Available
             of observations                observation         Reference                           files        as
period                                                                                                        standard
                                                                                           content data1 data2  data
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1979-1980       14 observ.                  6 sites             Aksnes et al (1984), Dourneau (1982)      Content Data1 Data2   no
1995-1996       66 observ.                 16 sites                      Thuillot et al (2001)            Content Data1 Data2   no
2008-2009       26 observ.                 17 sites                      Arlot et al (2012)               Content Data1 Data2   no

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Note: data1= data on the astrometric positions extracted from the mutual events
      data2= data of the observed photometric lightcurves; date and magnitude drop for each point