bracke
Depends which data provider you use. I believe the official Stock Exchange guidelines for the index say that the pre-opening auction is not used in setting the opening price thus yesterday's close = todays opening and there is never a gap. Some providers operate to these guidelines, others don't and do recognise a gap opening - all very confusing!!! Have had this argument with Sharescope who, until early May, operated to guidelines and did not recognise any opening gap but have now changed their feed and do recognise gaps. They haven't backdated the history files yet so the index charts look a bit of a mess! You can see the change on the attached chart.
jon