add ohser mode to example
add ohser mode to example

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