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Seyfert galaxies appear similar to normal spirals with extremely luminous cores.
Manipulated
Altered or controlled in a deliberate way, often used in the context of variables in experimental research.
Variable
An element, feature, or factor that is liable to vary or change.
Continuous Variable
A type of variable that can take an infinite number of values within a given range.
Categorical Variable
A variable that can take on a limited, and usually fixed, number of possible values, grouping individuals into categories.
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