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.
Definition of 'tyrant'. tyrant (taÉªÉrÉnt ) You can use tyrant to refer to someone who treats the people they have authority over in a cruel and unfair way. Since 1804 the country has mostly been ruled by tyrants. ...households where the father was a tyrant.