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Figure 7. Effects of training and testing with different force levels. Blue bars represent training at specified force levels (horizontal axis) and testing with all force levels, green bars when testing only at force levels different from training set, and gray bars when testing at same force level as training. Scheme E, Englehart K. Electromyogram pattern recognition for control of powered upper-limb prostheses: State of the art and challenges for clinical use. J Rehabil Res Dev. 2011;48(6):643-60.DOI:10.1682/JRRD.2010.09.0177