H I position-velocity diagram along the H I kinematical major axis of NGC 1427A’s bright stellar body constructed using the 11″-resolution cube at full velocity resolution (1.4 km s⁻¹). The diagram is centred at the dynamical centre and systemic velocity given in the text (vertical and horizontal white lines, respectively), and the axis has PA = 93°. The linear colour-scale ranges from −2σ to +8σ, where σ is the noise level. The white contours start at a +10σ level and increase by a factor $\sqrt{2}$ at each step. East is left, west is right.