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Fig. S1 Dimensions of the measured tap root of Melilotus siculus.

Fig. S2 Effect of finite element size on the model result.

Fig. S3 Sensitivity of the radial oxygen profile in the root to the value of the mass transfer coefficient h.

Fig. S4 Sensitivity of the computed radial oxygen profiles to the value of Km used in the Michaelis–Menten model for respiration.

Table S1 Input parameters to the root diffusion–respiration model

Notes S1 Root dimensions, model parameters, tissue diffusivity values, sensitivity of the model, oxygen flux analysis.

Video S1 Three-dimensional rendering of a computed tomography scan of a quarter section of a tap root with lateral roots of Melilotus siculus, clearly showing the dense stele and porous phellem.

Video S2 Three-dimensional rendering of the pore network in the phellem. The skeleton shows connections of the pores; the skeleton colours indicate the radii of the pores (1.65 μm, blue; 18 μm, red).

Video S3 Three-dimensional rendering of the pore network in the stele. The skeleton shows connections of the pores; the skeleton colours indicate the radii of the pores (1.22 μm, blue; 10 μm, red).

Video S4 Three-dimensional rendering of the pore network across the phellem and stele. The skeleton shows connections of the pores; the skeleton colours indicate the radii of the pores (1.22 μm, blue; 23.96 μm, red).

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NPH_3934_sm_NotesS1-FigsS1-S4-TableS1.doc427KSupporting info item
NPH_3934_sm_VideoS1.gif36735KSupporting info item
NPH_3934_sm_VideoS2.mpg23758KSupporting info item
NPH_3934_sm_VideoS3.mpg15302KSupporting info item
NPH_3934_sm_VideoS4.mpg36546KSupporting info item