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.
A dictatorship is a form of government characterized by the rule of one person or a small group of people who have no checks and balances on their power. While portrayed to their people as benevolent, loving rulers, dictators typically come to power simply to benefit themselves.