refactor: make dof a property to be calculated each time TODO: calculate includemask at time of fit....
refactor: make dof a property to be calculated each time
TODO: calculate includemask at time of fit....

pyspeckit/pyspeckit,keflavich/pyspeckit,jpinedaf/pyspeckit,low-sky/pyspeckit,e-koch/pyspeckit,keflavich/pyspeckit,pyspeckit/pyspeckit,vlas-sokolov/pyspeckit,low-sky/pyspeckit,vlas-sokolov/pyspeckit,e-koch/pyspeckit,jpinedaf/pyspeckit