IRAS2A off-position spectra, averaged over 1′′    ×    1′′ regions around the positions marked with “a” and “b” in Fig. 2 in the blueshifted outflow from the imaged data. The spectra have been rebinned to twice the velocity resolution (width of 0.23 km s^-1). The systemic velocity of the HO line is drawn with a vertical dotted line at v_lsr = 7 km s^-1, and the gray outline in the background is the on-source spectrum averaged in a region of the same size as the other spectra.