Graphs for which the second eigenvalue of the signless Laplacian does not exceed 4

This page is written in support of an article entitled "Graphs with the second signless Laplacian eigenvalue <= 4" which will eventually appear in "Special Matrices". We provide here several files in support of the article.

• List of such graphs with 26 or fewer vertices.
• Same list, Signless Laplacians in text.
• List of S-graphs.
• Same list, Signless Laplacians in text.