The 8 different line styles currently available with pllsty are difficult to visually distinguish from each other. Currently for my research plots I work around this deficiency of the default line style theme for PLplot by using a plsym.c patch (attached below) to define marks and spaces corresponding to more distinguishable line patterns. However, this approach is too inflexible since this alternative theme for the line styles is unlikely to be to everyone's taste. Thus, for maximum flexibility and convenience for setting line style themes, what PLplot really needs is a function to allow you to set marks and spaces for any given pllsty index (similar in concept to plscol0a which sets RGBA colours for any particular plcol0 index) and the ability to read marks and spaces style files (similar in concept to the -cmap0 and -cmap1 PLplot options for filling the default cmap0 and cmap1 tables).
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