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.
Medicine/Medical. a regulated course, as of diet, exercise, or manner of living, intended to preserve or restore health or to attain some result. 2. regime (defs 1, 2). 3. Grammar. government (def 9). Origin of regimen.