  We present combined Halpha+HI rotation curves for a sample of spiral
galaxies. Most of the velocity profiles (spectra at single points) in these
galaxies are asymmetric, preventing the use of standard methods like the first
moment analysis and the single Gaussian fitting. We thus propose a method
similar to the Envelope-Tracing method (Sofue & Rubin 2001) to analyse those
profiles from which we obtain HI rotation curves in good agreement with the
Halpha rotation curves. These final rotation curves provide the required high
resolution in the inner parts of the galaxies, but also extend out to typically
2-3 optical radii. They will hence allow us to investigate the distribution of
dark matter.
