X vs. X_Bps in rfc3448bis

["Phelan, Tom" <tphelan@xxxxxxxxxxxx>]

Hi Sally,
 
What's the difference between X and X_Bps?
 
Section 4.2 says X is the allowed sending rate in bytes per second.  Later, section 8.3 discusses an example of "an allowed sending rate of X packets per round-trip time".  Which is it, bytes per second or packets per round-trip time?  I think it's bytes/second and the example is just being casual.
 
Section 3.1 says X_Bps is the transmit rate in bytes/second.  I assume "transmit rate" == "allowed sending rate" because X_Bps is the result of the TCP throughput calculation, not some measurement of activity.
 
So that sounds to me like X and X_Bps are the same thing.  But the pseudo-code uses X sometimes, X_Bps others, and sometimes in the same line of code.  Particularly bothersome is the line in step 4 of section 4.3 that updates the allowed sending rate:
   X = max(min(X_Bps, recv_limit), s/t_mbi);
 
If they're the same, why would you use X_Bps in the min expression?  So I guess they aren't the same.
 
After writing all of this, I think I'm starting to get it -- X_Bps is the result of the TCP throughput equation calculation and X is the currently allowed sending rate, which might be less than X_Bps due to X_recv or other stuff.  Both are in bytes/second.  Is that accurate?
 
If I'm now correct, or not, PLEASE, make the text more clear.  Even better would be to also have a section that lists and defines all of the variables used.  I have compiled such a list in order to implement CCID 3.  I'd be happy to give you text for the section, that you could then correct :-).
 
Tom P.