The anatomy labeled with letter F in the image below is the: 
Definitions:
Degrees of Freedom
The number of independent values or quantities that can be assigned to a statistical distribution without violating any constraints.
Dependent Variable
A variable in an experiment or model that is expected to change as a result of manipulations or changes in the independent variable(s).
Independent Variables
Variables that are manipulated or categorized to determine their effect on other variables.
Quantity Minimized
Refers to the outcome of an optimization problem where the goal is to find the smallest possible value of a certain quantity.
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