Integrated intensity map (from −11 to +23 km s^-1) of SiO 8−7 in colors, overplotted with the blue (from −5 to +5 km s^-1) and red (from +9 to +15 km s^-1) wing emission from CH₃OH 7_−1,7–6_−1,6 in blue and red contours, respectively. The SiO peaks north of IRAS 4A close to the peak redshifted emission of CH₃OH and traces the shock activity in the region. No emission connected to IRAS 4C is observed. The red and blue contour levels are set to 5, 30, 50, 70, 100, and 150 × rms (rms: 0.02 K).