Possible Zeeman pairs in the 1665 MHz OH maser (a) to the north and (b) to the west of VLA 2. The RCP maser spots of a Zeeman pair are marked red and LCP in blue. Position errors are marked by crosses (RCP in black; LCP in grey). The average values of the estimated magnetic fields are indicated next to the possible Zeeman pairs. More robust values, that is, those with close spatial association of a pair and/or a few pairs that provide the same number, are in black, and less robust values are in grey.