The photograph of a disassembled sole of the left shoe seen from below. The position of the force transducers and their centres (white filled circles) are seen. The X-axis is defined as the axis running through the two extreme sensors (heel and toe). Negative and positive Y values denote outward and inward position, respectively, to the heel-toe axis. Letters A and B denote the two most extreme sensors along the Y axis. The vertical distance between them is denoted by dmax.