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private StringBuffer exportTikZstyle() {
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StringBuffer out = new StringBuffer();
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out.append("\\begin{tikzpicture}[font=\\scriptsize, xscale=0.45, yscale=0.45, x=1.33px, y=1.33px]\n");
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out.append("\\begin{tikzpicture}[font=\\scriptsize, xscale=0.45, yscale=0.45, x=1.33pt, y=1.33pt]\n");
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out.append("%% the figure can be scaled by changing xscale and yscale\n");
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out.append("%% positions of place/transition labels that are currently fixed to label=135 degrees\n");
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out.append("%% can be adjusted so that they do not cover arcs\n");