PCk_abs threshold

Hello,
First of all, thank you for publishing your code.

I am having some trouble understanding how absolute coordinates are evaluated in MupoTS.
What is the threshold value used when computing the PCK_abs? 
Because I noticed that the threshold for PCK_rel is 150 mm and 250 mm for AP root. But I am not sure about PCK_abs.


Thanks in advance for your response and your time.