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This paper has been withdrawn by the authors. It has been replaced by the papers: "Drawings of Planar Graphs with Few Slopes and Segments" (math/0606450) and "Graph Drawings with Few Slopes" (math/0606446).

The paper has been withdrawn.

This paper has been withdrawn by the author, due to possible counter-examples.

This paper has been withdrawn by the author(s), due an error in the proof.

This paper has been withdrawn by the authors due to its publication

The paper is being withdrawn since the authors felt that the submission is a little premature after a careful reading by some of the experts in this field.

This submission has been withdrawn at the request of the author.

This paper has been withdrawn due to disagreement of suggested results and methods between authors.

This paper has been withdrawn by the author, since most of the results have been published before.

This paper has been withdrawn by the author, due to a significant error in section 4.3.1.

The paper has been withdrawn by change of content and some errors in the examples.

This paper has been withdrawn to address an omission. It will be resubmitted in the near future.

This paper has been withdrawn due to its publication

This paper has been withdrawn by the author(s), due an error in the proof.

This paper has been withdrawn by the author.

withdrawn by the authors because of an error.

This paper has been withdrawn by the author due to an extended and largely modified version of the paper was published in arXiv (see arXiv:0807.3694, Disjoint minimal graphs).

This paper has been withdrawn by the authors due to its publication

This paper has been withdrawn by the authors due to a gap in the proof of the main result (in 5.3).

This paper has been withdrawn by the author.