The Pattern Speeds of NGC 3031, NGC 2366, and DDO 154 as Functions of
  Radius
  The pattern speeds of NGC 3031, NGC 2366, and DDO 154 are measured using a
solution of the Tremaine-Weinberg equations derived in a previous paper. Four
different data sets of NGC 3031 produce consistent results despite differences
in angular resolution, spectral resolution, and sensitivities to structures on
different scales. The results for NGC 3031 show that the pattern speed is more
similar to the material speed than it is to the speed of a rigidly rotating
pattern, and that there are no clear indications of unique corotation or
Lindblad resonances. Unlike NGC 3031, the results for NGC 2366 and DDO 154 show
clear departures from the material speed. The results for NGC 2366 and DDO 154
also show that the solution method can produce meaningful results that are
simple to interpret even if there is not a coherent or well-defined pattern in
the data. The angular resolution of a data set has the greatest affect on the
results, especially for determining the radial behavior of the pattern speed,
and whether there is a single, global pattern speed.
