fix default parameter values for model sets
fix default parameter values for model sets

astropy/astropy,astropy/astropy,larrybradley/astropy,mhvk/astropy,saimn/astropy,dhomeier/astropy,pllim/astropy,pllim/astropy,dhomeier/astropy,mhvk/astropy,StuartLittlefair/astropy,mhvk/astropy,larrybradley/astropy,saimn/astropy,larrybradley/astropy,aleksandr-bakanov/astropy,astropy/astropy,astropy/astropy,larrybradley/astropy,pllim/astropy,dhomeier/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,aleksandr-bakanov/astropy,lpsinger/astropy,mhvk/astropy,saimn/astropy,lpsinger/astropy,aleksandr-bakanov/astropy,dhomeier/astropy,saimn/astropy,lpsinger/astropy,dhomeier/astropy,saimn/astropy,astropy/astropy,lpsinger/astropy,pllim/astropy,pllim/astropy,lpsinger/astropy,larrybradley/astropy,StuartLittlefair/astropy,aleksandr-bakanov/astropy,mhvk/astropy,StuartLittlefair/astropy