Spatial distribution of GMA ﹩{M}_{{\rm{c}}}﹩ and observed radius defined in the 12 m observations. Green diamonds, blue circles, and red squares in the figure denote GMAs with M_c < 5 × 10⁶ ﹩{M}_{\odot }﹩, 5 × 10⁶ < M_c < 10⁷ ﹩{M}_{\odot }﹩, and M_c > 10⁷ ﹩{M}_{\odot }﹩, respectively. The circles indicate the average radius of the major and minor axes of the observed GMA boundary. The grayscale shows the integrated intensity map of the 12 m observations.