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.
regime - (medicine) a systematic plan for therapy (often including diet) regimen. plan, program, programme - a series of steps to be carried out or goals to be accomplished; they drew up a six-step plan; they discussed plans for a new bond issue.