Just how long is the ATLAS detector?

[ChrisVer]

A question that actually makes me laugh, but ... how long is the ATLAS Detector?
Based on the ATLAS page here: http://atlas.cern/discover/detector the detector is 46m long.
Based on references like here: http://arxiv.org/pdf/0910.3081.pdf the detector is 44m long.
I wouldn't have asked this if I didn't read in my text that ATLAS is 46m long but saw in my figure [taken from the above reference, but pretty much distributed around ] that it was 44m.
I wonder who is going to come and say "let's say 45m"

 

[berkeman]

Probably just a difference between the detector path length and the overall physical size?

 

[berkeman]

Hmm, no that can't be it...

https://inspirehep.net/record/878496/files/figures_AtlasDetectorLabelled.png

 

[mfb]

Depends on where exactly you measure, and which part of the services you count as part of the detector. Or maybe one of the numbers is just outdated.

While this is not the last muon chamber, consider this picture for example: where exactly does the detector components end? At the last sensitive element? At the last cable that goes from A to B within the detector? At the handrails?