Azimuthally averaged flux profile following the deprojection of coordinates from the 1.3 mm image of HD 141569 (blue), ¹²CO (green) and ¹³CO (red). Vertical black lines show the radial locations of rings identified in scattered light. Peak intensities for 1.3 mm continuum, ¹²CO and ¹³CO are 1.74 mJy beam⁻¹, 1.06 and 0.25 Jy km s⁻¹ beam⁻¹ respectively. Coloured dotted lines show NW (upper) and SE (lower) cuts of the ¹²CO and ¹³CO maps along the position angle of the ¹³CO peak. The shaded regions show the variation of the profile when changing inclination of the source by ±10°. Error bars are calculated as described in the text, the coloured dashed lines represent the noise level after averaging for each curve.