Possible Zeeman pairs of the 1665 MHz OH masers in the vicinity of VLA 1B. The RCP maser spots of a Zeeman pair are marked with red, and LCP spots are in blue. Positional 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 multiple pairs that provide the same number, are in black, and less robust values are in grey.