Keywords :
Clustering, dimensionality reduction, mappings, multidimensional scaling, multivariate data analysis, nonparametric, pattern recognition, statistics.; Algorithm design and analysis; Computer errors; Data analysis; Data structures; Euclidean distance; Helium; Multidimensional systems; Pattern recognition; Testing; Vectors; Clustering, dimensionality reduction, mappings, multidimensional scaling, multivariate data analysis, nonparametric, pattern recognition, statistics.;