Those minimum/maximum rates are different depending on if you state has medicaid expansion or not. But I think the rates you posted are federal poverty level f

Those minimum/maximum rates are different depending on if you state has medicaid expansion or not. But I think the rates you posted are federal poverty level for a family of 4. Obamacare coverage kicks in at 138% of FPL all the way up to 400% of fpl. Below 138% FPL disqualifies you for obamacare because you would qualify for state medicaid coverage.