M-N scatter has been succeeded and encapsulated by Clust, which is freely available as a straightforwardly installed and used package.
Basel Abu-Jamous, Rui Fa, David J. Roberts, and Asoke K. Nandi. “UNCLES: Method for the identification of genes differentially consistently co-expressed in a specific subset of datasets”. BMC Bioinformatics, 2015, 16: 184, doi: 10.1186/s12859-015-0614-0. View online | Download PDF