I'd like to draw a round segment, but dont know how.

Can you help me to draw something like this? enter image description here

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  • Using what package? pstricks? tikz? – Ian Thompson May 29 '14 at 20:27
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    Welcome to TeX.SX! Please help us to help you and add a minimal working example (MWE) that illustrates your problem. It will be much easier for us to reproduce your situation and find out what the issue is when we see compilable code, starting with \documentclass{...} and ending with \end{document}. – user31729 May 29 '14 at 20:44
  • Using package tikz. – user52675 May 29 '14 at 21:01
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    Your question leaves all the effort to our community, even typing the essentials of a TeX document such as \documentclass{}...\begin{document} etc. As it is, most of our users will be very reluctant to touch your question, and you are left to the mercy of our procrastination team who are very few in number and very picky about selecting questions. You can improve your question by adding a minimal working example (MWE) that more users can copy/paste onto their systems to work on. If no hero takes the challenge we might have to close your question. – Herr K. May 29 '14 at 21:25
  • God bless Ignasi :) – user52675 May 29 '14 at 22:07

This is just one possibility to do something similar to what you want


\draw[ultra thick] (0,0) coordinate[label=above:A](a) -- ++(3,0) coordinate [label=above:B](b);
\draw (b) to[out=110,in=70] ++(-2,0) node[below] (d) {D};
\draw ([xshift=-1cm]b) to[out=-70,in=-110] ++(2,0) node[above] (c) {C}--++(1,0);

enter image description here

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