  The present study is part of a broader programme, exploring the possibility
of involving the Microsoft Kinect$^{\rm TM}$ sensor in the analysis of human
motion. We examine the output obtained from the two available versions of this
sensor in relation to the variability of the estimates of the lengths of eight
bones belonging to the subject's extremities: of the humerus (upper arm), ulna
(lower arm, forearm), femur (upper leg), and tibia (lower leg, shank). Large
systematic effects in the output of the two sensors have been observed.
