Once you know what the graph is about, you can read the data. You should always look at the scale on a time graph. The scale may go up in ones or count in steps. It might not show every number.

But assessing for planarity amid the addition and removal of edges is difficult without drawing the graph yourself and trying not to cross any lines (See “The Three Utilities Problem” below ...

Ljiljana Branković, Dragoš Cvetković, THE EIGENSPACE OF THE EIGENVALUE -2 IN GENERALIZED LINE GRAPHS AND A PROBLEM IN SECURITY OF STATISTICAL DATABASES, Publikacije Elektrotehničkog fakulteta. Serija ...