Figure 4. Radial movement measured on live bark and sapwood in six Eucalyptus tereticornis trees. Left-side panels show data were recorded below the girdle, right-side panels show data recorded above the girdle before (top panels; 6-10 May) and after (bottom panels; 20-24 May) all bark was removed 60 cm above the stem base. Data recorded on live bark (black line) contain the combined signals of reversible (dD b) and irreversible (dD Gempir) expansion of live bark and the cambial region (see text for more details), while those recorded on sapwood (grey line) represent reversible expansion of xylem (dD x) only. Panels (e) and (f) depict irreversible growth of stems based on interpolated dendrometer measurements that contain hydraulic and osmotic signals (D Gempir) and those that have been stripped of these signals (D G+). Grey sections indicate night-time (19:00-07:00 h).