Define sigma_lower/sigma_upper in the init
Define sigma_lower/sigma_upper in the init

larrybradley/astropy,larrybradley/astropy,lpsinger/astropy,bsipocz/astropy,dhomeier/astropy,larrybradley/astropy,mhvk/astropy,MSeifert04/astropy,astropy/astropy,saimn/astropy,bsipocz/astropy,StuartLittlefair/astropy,pllim/astropy,stargaser/astropy,mhvk/astropy,dhomeier/astropy,bsipocz/astropy,StuartLittlefair/astropy,lpsinger/astropy,mhvk/astropy,stargaser/astropy,pllim/astropy,mhvk/astropy,dhomeier/astropy,lpsinger/astropy,saimn/astropy,astropy/astropy,dhomeier/astropy,dhomeier/astropy,mhvk/astropy,aleksandr-bakanov/astropy,astropy/astropy,MSeifert04/astropy,pllim/astropy,aleksandr-bakanov/astropy,saimn/astropy,astropy/astropy,saimn/astropy,pllim/astropy,saimn/astropy,aleksandr-bakanov/astropy,astropy/astropy,StuartLittlefair/astropy,aleksandr-bakanov/astropy,MSeifert04/astropy,StuartLittlefair/astropy,lpsinger/astropy,bsipocz/astropy,pllim/astropy,stargaser/astropy,stargaser/astropy,MSeifert04/astropy,StuartLittlefair/astropy,larrybradley/astropy,larrybradley/astropy,lpsinger/astropy