Fig. 3
From: Non-invasive monitoring of hydraulic surge propagation in a wounded tobacco plant
a A mathematical model of the shift of diffraction patterns due to the shift of a barrier (stem) by 1 μm to the left and to the right. b A calibration measurement. The tobacco plant was placed on a movable table and was shifted with a 1 μm step. The positions of the second dark fringes, counted from the corresponding margins of the shadow region, were determined in every stem position. The symbols L0 and R0 indicate coordinates of the second dark fringes corresponding to the starting position of the stem labeled as “0”. The relationship between the stem position and the coordinates of the second dark fringes was used for the calculation of calibration lines used for the evaluation of experimental data. SE means standard error