Total integrated intensity (−40 < ν < 40 km s^-1; grey shades are from 10% of the peak emission, 43 K k ms^-1, in steps of 5%) of the SiO(5−4) transition observed with APEX. The red and blue contours are the red- (5 < ν < 40 km s^-1) and blue-shifted (−40 < ν <  −5 km s^-1) integrated emission observed with APEX (contours are 50% of the peak emission (9.4 K k ms^-1 for the red emission, 17.6 K k ms^-1 for the blue emission) in steps of 10%). The green contours represent the 2.12 μm H₂ emission. The white arrows label the OF1 and OF2 outflows. The black circle marks the APEX beam centred on the peak of the APEX SiO emission, as in Fig. 2.