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The pattern speeds of NGC 3031, NGC 2366, and DDO 154 are measured using asolution of the Tremaine-Weinberg equations derived in a previous paper. Fourdifferent data sets of NGC 3031 produce consistent results despite differencesin angular resolution, spectral resolution, and sensitivities to structures ondifferent scales. The results for NGC 3031 show that the pattern speed is moresimilar to the material speed than it is to the speed of a rigidly rotatingpattern, and that there are no clear indications of unique corotation orLindblad resonances. Unlike NGC 3031, the results for NGC 2366 and DDO 154 showclear departures from the material speed. The results for NGC 2366 and DDO 154also show that the solution method can produce meaningful results that aresimple to interpret even if there is not a coherent or well-defined pattern inthe data. The angular resolution of a data set has the greatest affect on theresults, especially for determining the radial behavior of the pattern speed,and whether there is a single, global pattern speed.

The Pattern Speeds of NGC 3031, NGC 2366, and DDO 154 as Functions of Radius