Lossy compression. File-size reduction (%) as a function of lossy JPEG quality parameter, for a) UT single-differential (S
) signals and c) MG monopolar (M
) signals. Signal-to-noise ratio (SNR) in decibels (dB) as functions of lossless JPEG quality parameter, for b) UT muscle and d) MG muscle. Mean values are represented by small filled circles and (mean values ± standard deviations) are shown by bars.