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header = "linescan frequency = %f kHz\npixel length = %f mm\ngauge length = %f\ntime [msec], ROI1 displacement [mm], ROI2 displacement [mm], relative displacement [mm], strain [-]" % (p["scan rate"], p["px2mm"], L0*p["px2mm"])
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np.savetxt(os.path.join(path, "linescan_analysis.dat"), np.column_stack((x, y1, y2, y3, strain)),
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np.savetxt(os.path.join(path, "linescan_analysis.dat"), np.column_stack((2*x, y1, y2, y3, strain)),
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print "wrote output file linescan_analysis.dat to directory [%s]" % (path)