www.bbc.co.uk/news/election-2016-scotland-36124382
If they vote to stay in the EU (the party line) and the stats are driven down and show that had Scotland voted on their own they would have wanted to stay then that supports the call for indyref2 if Brexit wins, but if they vote to leave there is more chance of Brexit winning and therefore an excuse to call for indyref2 (if figures show that Scotland would have voted to stay). 