Techniques are provided for reducing mismatch between the in-phase and quadrature channels of a communications transmitter or receiver. The trunk support 2 is bendable only inwardly, and holds and supports the trunk of the human body. The memory testing apparatus further divides each of the memory devices into a plurality of areas, and tests each area sequentially until a bit failure is detected in the area thereby attenuating testing time. In response to a user’s activation of a particular editing operation that affects the data, a resulting visual representation is generated.