A valve and a device for actuating the rotation of a stand of a motorcycle comprising an hydraulic actuator operating an actuating member between a first and a second position bringing the stand from a rest position to a supporting position. The orthogonal transform coefficients are adjusted by selecting essential orthogonal transform coefficients with high energy and non-essential orthogonal transform coefficients with low energy, maintaining or strengthening the essential orthogonal transform coefficients and attenuating or removing the non-essential orthogonal transform coefficients. The second masking layer is etched through in a second portion of the area to expose the n-well region. The anchor assembly comprises a pair of atraumatic anchor ends and a resilient member positioned between the anchor ends. The image reading apparatus of the invention allows the user to select and change over freely the ordinary image reading mode and fine reading mode, and allows the value of n to be selected freely depending on the resolution of the desired image. The aforementioned groove has an essentially mixtilinear rectangular section, of which the base is formed in cross-section by a central portion in the form of a convex root face forming a support extending on each side into a fillet recessed from the supporting plane.