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.
In a variety of medical contexts a regime is a set of rules or procedures to be followed in treating patients over a period. It is frequently used in terms such as therapeutic/therapy regime, treatment regime, and chemotherapy regime. Typically, a regime sets out the dosage and frequency of drugs or radiotherapy to be used, and often other aspects of medical care.