The automatic region selection (ARS) allows two different selection methods. ARS-1 takes an exposure of the sun and locates the brightest points and selects the brightest four locations. Normally the sequence table simply uses the single brightest active region. ARS-2 allows the operator to specify a sub-region of the sun, and the tracking algorithm will point to the brightest region within that sub-region. ARS-2 is normally used to force the pointing to stay on a fixed region, and to correct for solar rotation. See the ``Red Book'' article for more details on the region selection.