Digital BW, The Print

For the MIS Variable Tone Hex set, I cannot determine for sure, by 
eyeballing my purge patterns, whether the Medium Grey ink is in the 
yellow or light cyan position (the inks are only labeled according to 
their corresponding color positions). It almost looks as though it's 
in the yellow position. However, I just read a paper about the new 
ultratones that stated the Medium Grey was in the Light Cyan 
position, so I think it may just be my eyes.

Can someone let me know in which corresponding color chambers the 
Medium Grey and Light Grey reside for the MIS Variable Tone Hex set?

Thanks,

Mike