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Figure 4


Fig. 4. Water displacement (WD) method and inert gas volumetric (IGV) method comparisons. (A) Both methods predict a similar increase in tracheal volume with mass. (B) Estimate of tracheal volume using the WD method versus IGV method for the same individuals. (C) The difference between the tracheal volume estimates using the WD method versus the IGV method as a function of body size. The WD method predicted larger tracheal volumes than the IGV method, with absolute difference increasing with animal size.