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Observed versus modeled cell collapse of ATT tracheids in P. grayi. Observed collapse data are the same as shown in Figure 3B (squares) while modeled values are shown as curves. Cell wall elastic modulus is unknown for tracheids, and hence two values for the radial modulus of Picea abies green wood are used for comparison. The larger of these estimates appears to be close to the real value for the tracheids observed here.
