Now plot2d is complete. There are some more options to implement, but It can print everythin: discrete plots with (optional) errorbars , lisp functions (also lambda functions) and gnuplot functions (lisp strings containing something like "sin(x)" ). Now we can do everything CGN can do (except plotting histograms) with only this function.

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Since now plot2d understands errorbars.

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Now plot-scatter-graphic supports a key parameter called fit-function. It's a string with a gnuplot function. I've also updated doc strings and the pdf manual.

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