Maps of the emission of GA along the entire southern outflow of L1157, for all three transitions. The first contours are drawn at 3σ and the following with a step of 1σ (1σ = 0.1 K km s⁻¹ for the 8_0,8 − 7_1,7 transition, 0.05 K km s⁻¹ for the S_1,s − 7_0,7 transition and 0.1 K km s⁻¹ for ^the 10_1,10 – 9_0,9 transition). Note that we masked out the noise at the edge of the maps, and that the rms was estimated at the center of the maps; therefore the first contour might be at slightly less than 3σ in B2, which is close to the noisier edge of the maps.