LOS magnetograms corresponding to AR 10268 at four different stages of its emergence. The red- and blue-shaded areas represent the positive and the negative LOS magnetic field component. The red (blue) contours correspond to positive (negative) magnetic field with a strength of 20 G (−20 G) and 500 G (−500 G). The magnetograms are limited to square regions adjusted to the evolution of the AR extension.