MBS AFTERNOON: Bona Fide ground-holding

4.5's, by far the most actively traded today are back up to 101-19 only 2 ticks down on the day.

Both the 4.5 and 5.0 are just above base camp levels.  The 4.5 has 2 bids at 101-19, a good sign...

The 4.0 is doing nothing and hasn't all day.