Maps of the strongest line from each isotopologue detected in PdBI observations at 1.37 mm. The intensities have been derived by integrating the line emission over the velocity range shown in Fig. . The synthetic beam is shown at the bottom left of each panel. White contours show the continuum (at 4σ, 14σ, and 24σ levels with σ = 0.94 m Jy beam^-1), purple contour reveals the region where molecular specific intensity >3σ, and the dashed green contour reveals the negative specific intensity beyond −3σ because of the interferometric side lobe effect. Green lines in the SO map sketch the outflow directions. All images have different color scales (in mJy beam^-1 km s^-1), increasing from black to white, which are optimized to emphasize the features in the distribution of each line.