s.plot.convex.hull(ch.isotopes.sources, ch.isotopes.mixtures,
ch.n.mixtures, n.sources, n.isotopes, names.sources, names.isotopes,
ch.names.mixtures, title.mixture, ch.isotope.mvn.sample,
ch.concentration.sources, ch.efficiency.sources, ch.isotope.sigma,
tit, analysis.name, filename.prefix, ch.plot.filename, plot.format.list,
ch.matrix.sw = 0)