Lower and upper panels show the absolute position and LSR velocity of the 1665 MHz and 1667 MHz OH masers, respectively. For the 1665 MHz masers, the LCP and RCP features are indicated with empty pentagons and stars, respectively. Empty squares and empty triangles indicate the LCP and RCP features of the 1667 MHz masers, respectively. Symbol area is proportional to the logarithm of the feature intensity. The black dashed line in the lower panel shows the axis of projection of the OH maser positions to produce the position-velocity plot of Fig. 6. Colors, the gray-scale map, and the white big dots, have the same meaning as in Fig. 1.