(a) MDI magnetogram obtained May 17, 2000 at 01:39 UT. Values in the range of −3,500 to +3,500 Gauss are represented in grey-scale, (b) the contrast stretched version of the magnetogram. Values with the equivalence of −823 to +823 Gauss are represented in grey-scale, (c) median filtered version of the contrast stretched magnetogram, (d) magnetic region segmentation map. The grey and white regions on the segmented map represent the negative and positive regions on the magnetogram, respectively.