This indicator show the net liquidity of the FED.
Net Liquidity = FED balance sheet (total asset) - Treasury General Account - Reverse Repo
Net liquidity and Net liquidity changes are shown on wednesday. Total asset and TGA report are on weekly basis, thus a daily basis would be inacurate.
it is possible to add this indicator twice and move one of them in another graphic below and show the change. It gives a clear view of the liquidity.