plot(x,y, "linecolor",4, "linewidth",3, "splinetype",3);in order to get a thick red and smooth curve. These options are not included in the Tela documentation itself however. Rather, you must find them in these two PlotMTV documents: The full PlotMTV data format documentation is about 100 pages and does not conform to Adobe conventions (thus viewing it with Ghostview is clumsy). You are better off just printing it if you need more advance features such as how to produce logarithmic axes with nonuniform grid spacing.