a) 870 μm map of the filament in which Cha-MMS1 is embedded, obtained with LABOCA as part of an unbiased survey of Chamaeleon I (Belloche et al. 2011a). The contour levels correspond to − a, a, 2a, 4a, 6a, 8a, 12a, 16a, 24a, 32a, with a = 36 mJy/21″-beam (3σ). The white cross at α_J2000 = 11^h06^m3313, δ_J2000 = −77°23′35.1′′ is the Spitzer position of Cha-MMS1. The position of the nearby Class I object IRAS 11051-7706 is also shown with a black cross. b)−f) Zoom-in of the positions (P, white/black crosses/triangles) observed with APEX and Mopra. P₁ is the central position. Panel b) refers to CO 6−5 (white crosses), ¹³CO 6−5 (white crosses), and CO 7−6 (black crosses); c) to HCO⁺ 3−2 and H¹³CO⁺ 3−2; d) to CS 5−4, H¹³CO⁺ 4−3, and CO 4−3; e) to C¹⁷O 2−1 and C¹⁸O 2−1 (all with APEX); and f) to the Mopra observations (see Table 3). The spacing between adjacent positions is 11.4′′ in panels c) and d), and 14′′ in panel e). In panel f), it is 17.5′′ for the positions perpendicular to the filament and 35′′ for the positions along the filament. For panel b) the pixel spacing of the CHAMP⁺ array is 20′′ for the white and 15′′ for the black crosses relative to P1. The black (CO 7−6) and white (CO 6−5) open triangles mark the positions observed with CHAMP⁺ centred on the offset position at (5.3′′, 8.3′′) relative to Cha-MMS1 (filled triangle).