Abbreviation	Type	Name
DI	2D image	Orthographic projection of the 3D surface of the subject
MDI	2D image	Mean depth image
fMDI	2D image	Horizontally-flipped mean depth image
MSCM	Group of MDI	Group of MDI
n	Numeric	Number of step cycles
i	Numeric	Interval of the step
${∆}_z$	Numeric	Longitudinal global displacement
${∆}_x$	Numeric	Lateral global displacement
c	Numeric	Step cycle number
s	{R,L}	Step side
$∆R_{(i)}^{lat}$	Vector	Lateral asymmetry at the right leg
$∆L_{(i)}^{lat}$	Vector	Lateral asymmetry at the left leg
$∆R_{(i)}^{long}$	Vector	Longitudinal asymmetry at the right leg
$∆L_{(i)}^{long}$	Vector	Longitudinal asymmetry at the left leg
Ilong(i)	Numeric	Longitudinal asymmetry index value at the instant i of the step
Ilong	Numeric	Mean value of the longitudinal asymmetry index for the step
SRlength	Numeric	Right step length versus left step length ratio
SRduration	Numeric	Right step duration versus left step duration ratio