Positions observed with SOFIA in the L1157 bipolar outflow, which is emanating from the embedded Class 0 source L1157-mm. The background colour map shows an image in the H₂ 0–0 S(1) line at 17 μm (from Nisini et al. 2010b) with superposed contours of the integrated CO (2–1) emission (from Bachiller et al. 2001). The targeted positions of the presented CO (12–11) observations with GREAT are labelled and indicated with circles, with diameters equal to the actual beam size of 213 of the GREAT beam.