A Data File consists of a collection of Data Series that have the same origin. EMG data is often collected from a number of muscle sites, resulting in files containing multiple channels of data (where each channel is represented by a Data Series). It is also common that the same analysis is desired for all of the channels. The Data File was created for this reason. It allows Data Series to be organized together, and it allows operations to be performed on all of the Data Series that it contains.