One can make a color-color plot by arranging stars in a two-dimensional graph, where each axis measures a different color index. Below are some examples from the SDSS, which uses a set of broadband filters called (u, g, r, i, z); they are very roughly equivalent to (U, B, R, I, _).
regime - the organization that is the governing authority of a political unit; the government reduced taxes; the matter was referred to higher authorities. authorities, government.
The term  political regime  is used to designate the basic structure, or system, of govern-ment existing and operating in a given political society. The term refers to the fundamental approach to governing a society, e.g., the constitutional approach or the dictatorial ap-proach.