Position‐velocity plot for components of OH 39.7 + 1.5 in the VLA maps of EWWB, who plotted the radial velocities for an assumed stellar velocity of 20.0 km s⁻¹. The coding is for the different observing epochs: 1990 February (squares); 1990 June (inverted triangles); 1991 August (circles); and 1992 December (triangles). The inner and outer bounds of EWWB are shown as thin ellipses; the orthogonal thick‐line ellipse shows the new inner bound proposed here.