Boxplot showing the distribution of time differences between maximum bubble detection and maximum growth rate. Blue boxes correspond to C/NOFS driven growth rates, while orange boxes correspond to Fejer–Scherliess driven growth rates. The boxes on the left show the distribution during 2008/2009, while the box on the right shows the distribution during 2011/2012. The box extent is one quartile from the median, while the whiskers extend to the fourth quartile. Each black circle marks the time difference for one season/zone sector.