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.
Learner's definition of TYRANT. [count] 1. : a ruler who has complete power over a country and who is cruel and unfair. The country was ruled by a corrupt tyrant [=despot] for decades. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples. 2. : someone who uses power in a cruel and unfair way.