Integrated intensity maps for the HDO 3_1,1 − 3_3,1 and HO 3_1,3 − 2_2,0 in the interval v_line    ±    FWHM toward all three sources. The beam is shown in the lower right corner and the red crosses show the position of continuum peaks. Contours start at 41.1 mJy km s^-1 (5σ steps for HO and 20σ for HDO) for IRAS 2A, 50.1 mJy km s^-1 (2σ steps) for IRAS 4A, and 29.8 mJy km s^-1 (2σ steps) for IRAS 4B, dashed contours represent negative values.