Not quite(?) Unless I misread it...
(I find Since87's graphs rather confusing)
Will try and codge something up in Excel to illustrate (see if it works?!)
Edit:
I only have Cathars graphs to work off for the PQ data, so unforetunately the inclusion of the 1/2" tubing + rad is going to mess things up somewhat. (I would have liked to plot 2 or 3 blocs on this graph to compare)