  We present VLBA observations of the ground-state hydroxyl masers in W3(OH) at
0.02 km s-1 spectral resolution. Over 250 masers are detected, including 56
Zeeman pairs. Lineshapes are predominantly Gaussian or combinations of several
Gaussians, with normalized deviations typically of the same magnitude as in
masers in other species. Typical FWHM maser linewidths are 0.15 to 0.38 km s-1
and are larger in the 1665 MHz transition than in the other three ground-state
transitions. The satellite-line 1612 and 1720 MHz masers show no evidence of
sigma^+/-2,3 components. The spatial positions of most masers are seen to vary
across the line profile, with many spots showing clear, organized positional
gradients. Equivalent line-of-sight velocity gradients in the plane of the sky
typically range from 0.01 to 1 km s-1 AU-1 (i.e., positional gradients of 1 to
100 AU (km s-1)-1). Small velocity gradients in the 1667 MHz transition support
theoretical predictions that 1667 MHz masers appear in regions with small
velocity shifts along the amplification length. Deconvolved maser spot sizes
appear to be larger in the line wings but do not support a spherical maser
geometry.
