Under BCBS 248 intraday liquidity monitoring, Hawthorn Bank's peak negative intraday position reaches -$3.2 billion at 11:00 AM. The bank started the day with $4.5 billion in pre-positioned collateral at the central bank and received $1.8 billion in inflows by 11:00 AM. What was Hawthorn's available intraday liquidity at its peak negative point?