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Recent studies of methanol and ground-state OH masers at very high spectralresolution have shed new light on small-scale maser processes. The nearbysource W3(OH), which contains numerous bright masers in several differenttransitions, provides an excellent laboratory for high spectral resolutiontechniques. We present a model of W3(OH) based on EVN observations of therotationally-excited 6030 and 6035 MHz OH masers taken at 0.024 km/s spectralresolution. The 6.0 GHz masers are becoming brighter with time and showevidence for tangential proper motions. We confirm the existence of a region ofmagnetic field oriented toward the observer to the southeast and find anothersuch region to the northeast in W3(OH), near the champagne flow. The 6.0 GHzmasers trace the inner edge of a counterclockwise rotating torus feature.Masers at 6030 MHz are usually a factor of a few weaker than at 6035 MHz buttrace the same material. Velocity gradients of nearby Zeeman components aremuch more closely correlated than in the ground state, likely due to thesmaller spatial separation between Zeeman components. Hydroxyl maser peaks atvery long baseline interferometric resolution appear to have structure onscales both smaller than that resolvable as well as on larger scales.

Structure of W3(OH) from Very High Spectral Resolution Observations of 5 Centimeter OH Masers