Three-dimensional maser structure of G107 obtained with the VLBI data and time delays of persistent feature peaks. The 6.7 GHz methanol and 1665 MHz hydroxyl cloudlets are shown as circles and triangles, respectively. The size of symbol is proportional to the logarithm of brightness and its colour corresponds to the LSR velocity scale shown in the horizontal wedge. The vertical bar for one cloudlet in each spectral feature denotes the uncertainty of the delay. The fitted position of protostar (orange star symbol) coincides within 1σ with the measured position of the 1.3 mm continuum emission (Palau et al. 2011). The top and bottom panels show face-on and edge-on view of the ring-like structure. The green dashed circle in the top panel denotes the best fit to the methanol data at the fourth epoch of VLBI observation, whereas the green dashed line in the bottom panel indicates the plane ofthis ring-like structure. The symbols surrounded by the red circles represent the methanol maser cloudlets seen only at the fourth epoch of VLBI observations.