  We present high resolution two-dimensional velocity fields from integral
field spectroscopy along with derived rotation curves for eleven low surface
brightness galaxies. We fit NFW and pseudo-isothermal halo models to the new
data combined with previous long-slit and HI data. In most cases we find the
pseudo-isothermal halo to better represent the data than the NFW halo, as the
NFW concentrations are often lower than expected for a LambdaCDM cosmology. We
also compare our results to previous studies and find that including the new
two-dimensional optical data does not significantly alter the halo parameters,
but does decrease the uncertainties by roughly a factor of 2.

Astrophysics