The Fed sneaked in an additional 6.25B overnight RP today. I remember it wasn't on the fed site at the time of the post by "federal reserves".
So the 1.75B drain became a 4.5B injection.
The situation for tomorrow so far is just the drain from the maturity of today's $6.25B injection. Maybe we will get a bigger net drain tomorrow instead of the small one it looked like we would have today.