Longitudinal arrangement of signals. Longitudinal arrangement—signals are taken in the left-to-right (odd rows) and right-to-left (even rows) sequence from the electrode matrix. Rows are parallel to the longitudinal axis of the muscle. The beginning of the sequence and its end are indicated by triangles and the words “start” and “finish”. Arrows indicate how single-differential signals are taken as the differences between adjacent electrodes, which are represented by points. Each electrode corresponds to a monopolar signal. The image is formed by positioning one signal above the other, in the same sequence that they are taken from the electrode matrix.