A computer automated method for setting visualization parameter boundaries in a preset for displaying an image from a 3D data set applicable to magnetic resonance data, computer tomography data and other 3D data sets obtained in medical imaging is described. The electric connector is suitable for connecting a receptacle of a portable electronic device and includes a body, a plug, a sliding base, and a magnetic component. The light sources include light sources of three or more colors. The second material preferably has a thermal conductivity greater than the thermal conductivity of the first material. The invention is applicable to a variety of resilient surface covering products including floor and wall coverings which otherwise have a wearlayer which can be softened by heating. A current-limiting circuit is connected in series with the second charge control switch for limiting the charging current when charging is performed.