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Thanks Eric, I got it to work now. To summarize the code to get the axis information from an atom spec string looks like this. Please let me know if there is a better or simpler way to do it.<br>
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<span style="font-family: "Courier New", monospace;">#-----------------------------------</span><br>
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<span style="font-family: "Courier New", monospace;">import StructMeasure</span><span><br>
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<div><span style="font-family: "Courier New", monospace;">atomspec = '#0:14-37.A@CA'</span><br>
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<div><span style="font-family: "Courier New", monospace;">atoms = chimera.selection.OSLSelection(atomspec).vertices()</span><br>
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<div><span style="font-family: "Courier New", monospace;">xyzs = chimera.numpyArrayFromAtoms(atoms)</span><br>
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<div><span style="font-family: "Courier New", monospace;">myaxis = StructMeasure.axis(xyzs)</span><br>
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<span style="font-family: "Courier New", monospace;">print myaxis</span><br>
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<span style="font-family: "Courier New", monospace;">#-------------------------------------</span></div>
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Note that I had to import <span>StructMeasure</span>.</div>
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Best</div>
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H.</div>
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