Unfortunately I can not open up the info in these charts in any more detail, these are just a sample of data which is available from legal markets.
In a nutshell; if there is such a strong trend towards kickoff it means that there is very good reason to believe that a certain outcome is going to happen, in one way or another. In all of these cases the key factor was that the suspected players were added (or removed, or both) in the official lineup. The interesting fact is that when they were removed from lineup of team A the odds of team A dropped significantly and the other way around; when they were added to the lineup the odds of the team rose even if the players in question should had been the 3 best players on the pitch.
OK then, local newspaper came out today with a story on this, based on De Telegraaf. http://www.iltasanomat.fi/jalkapallo/art-2000001271628.html
VastaaPoistahttp://www.telegraaf.nl/telesport/voetbal/26701931/__Matchfixingrel_Hollands_viertal__.html
So the charts above are all from Atlantis matches. The most interesting U-shaped chart is from Atlantis vs Kiffen game. The chart shows odds for Kiffen -1.5. When it turns down big at around 09:30 the first official lineup was out at local bookie Veikkaus website and odds of Kiffen big win dropped from 2.2 to around 1.7. The funny thing is that at that time it was announced that the 3 Dutch players would all start. For an unknown reason however the players announced themselves sick later, they were removed from the starting lineup and all of a sudden Kiffen win was not all so likely anymore.