HN 39:
Other than the possible oscillatory FD effects of a variable rate of decay of TAS due to pitch inputs, it looks to me very representative of the precision associated with someone attempting to fly a flight director, to the extent of making the hairs stand up on the back of my neck.
You're the physics dude, I defer to you on the details.
(Lyman: You need to check IR #3 for when the FD's were actually available. My opinions only refer to the
insightful graph.
)