Integrated intensities of the CO J = 8 → 7 (left) and CO J = 9 → 8 (right) lines towards the F1 and F2 clumps are shown in the colour scale. The contours are mass surface density from Butler & Tan (2012), with the contours starting at 0.075 g cm^-2 and increasing by increments of 0.075 g cm^-2. The blue diamonds are the locations of the F1 and F2 cores, with the top left core being F2. The large blue rectangles denote the area surveyed with Herschel. The cross gives the location of the 24 micron source associated with the F1 clump (Chambers et al. 2009) and the “X” gives the location of the Rathborne et al. (2006) MM7 clump. The blue circles have diameters equal to the half power beam width of the Herschel beams.