vlsr prior is too narrow

[SebaMarino]

I think the prior used by fit_map() for vlsr of +-10km/s is too narrow and incompatible with some discs.

[richteague]

You should be able to use the set_prior() function to change this. Something like cube.set_prior('vlsr', [-1e4, 1e4], 'flat') for a uniform prior between -10km/s and +10km/s, or cube.set_prior('vlsr', [0.0, 1e4], 'gaussian') for a Gaussian prior centered at 0 with a standard deviation of 10km/s.

I'll add this to the documentation when I can!

[SebaMarino]

Thanks!