A downloadable version of the macro is available [[media:chromatograms.tex|here]], and a PDF example of the output [[media:Chromato.pdf|here]].
<small><pretexcode>
\newdimen\Width \newdimen\Height
\define[3]\Chromato{%
\Rpfeil{40}1 \Rpfeil{80}2 \Rbrace{60}{0.4}3{\txx1--2}}
\stoptext
</pre></smalltexcode>