Details of the north (top) and south (bottom) bow-shocks in the [O iii] light. The field of view in each panel is 10′ × 4′. North is up, east is left. The slit position for the lower resolution spectrum is indicated by the long (blue) slit. The reference star 2MASS J21131972+5925365 adopted as the zero-point of the x-axis in Fig. 8 is visible at its north end. The positions for the higher resolution spectra are indicated by the short (red) slits.