I am trying to make sense of VIX futures settlement vs close data. While I understand the definition of settlement vs close I am not able to wrap my head around their published data. Please see attached file. This is Jan 2017 VIX futures contract. Why is there a settlement on 4-25-2016 before the contract opens for trading on 4-26-2016? Related to this is also another contract M2009. Why is there a settlement on 06/17/2009 with open, low and close being all 0. This contract also has settlement on 08-28-2008 without any open, high, low, etc.