Luminosities of far-IR lines observed with FIFI-LS (dashed lines) and GREAT (dotted lines) along the major axis of the DR21 Main H₂ outflow, integrated inside ten boxes of 16.5^′′ × 50^′′ each (the same boxes as in Fig. 5). The luminosities for [O I] 63.18 μm and [C II] 157.74 μm are normalized to the FIFI-LS maximum luminosity. The X-axis shows the offset from the adopted center of DR21 Main (20^h39^m00^s93, +42^∘19^′42).