English: This diagram shows the interface between the graphs of finite 3-groups with coclass 1 and 2 and abelianization of type (3,3). Important vertices are labelled with their SmallGroups Library identifier in angle brackets. The vertices 5, 7, 57 and 45 are most densely populated by second 3-class groups of complex quadratic fields with discriminant in the range -10^8<d<0. The underlined counters adjacent to the ovals surrounding these vertices give the absolute and relative frequency of the distribution. TKT means transfer kernel type.
User:DanielConstantinMayer replaced the png file by a tiff file with higher resolution, thereby adding more details, and in particular, supplementing two missing groups <2187,274> and <2187,275>. Additionally, two counters (83352 and 40967) had to be increased by 1, since a minor error occurred in the current version of the paper by Boston, Bush and Hajir.