The chart probably shows this: SRF stands for the Federal Reserve's Standing Repo Facility, which is a monetary policy tool. The Fed provides overnight collateralized loans to inject liquidity into banks and alleviate liquidity pressures. Here's how it works: financial institutions like banks pledge their Treasury bonds or MBS (mortgage-backed securities) to the Fed the day before, sell them to the Fed to get cash, and then buy back the securities from the Fed the next day. The price difference between selling and buying can be seen as the Fed's interest income. This helps ease market liquidity tightness and aims to prevent short-term interest rates from rising above the upper limit of the federal funds rate. SRF can also be referred to as the Fed's Overnight Repo Operation (ON RP), which is a method to release short-term liquidity into the market. On the other hand, the Overnight Reverse Repo Operation (ON RRP) is a tool the Fed uses to withdraw liquidity from the market. Sometimes liquidity tightness can also be a result of emotional contagion, similar to a bank run. Simply providing confidence to the market can prevent panic from spreading. For example, in March 2023, when the Silicon Valley Bank collapsed and triggered a crisis among small and medium-sized banks, the Fed quickly introduced the BTFP (Bank Term Funding Program) tool, which gave the market confidence and prevented the crisis from spreading further among smaller banks.