A close-up view of the CH₃OH maser features detected around IRAS 18556+0138 (G35.20–0.74N). The triangles symbols are the identified CH₃OH maser features scaled logarithmically according to their peak flux density (Table 4). The maser LSR radial velocity is indicated by color. A 6 Jy beam^-1 symbol is plotted for illustration. The linear polarization vectors, scaled logarithmically according to polarization fraction P_l, are overplotted. The dashed line is the best linear fit of the CH₃OH masers (PA = 140°). The two arrows indicate the direction, but not the origin, of the collimated CO-molecular bipolar outflow (PA = 58°; Gibb et al. 2003).