REDTEN stores the components of an indexed object in a list attached to the tvalue property of the object. The list is sparse: if a component is missing it is assumed to be zero. These components are referred to as ``explicit'' components. If the object is made with the implicit flag set, each non-existent explicit component is replaced by an ``implicit'' component (unless the symmetries prevent this). The implicit component is simply the object name and the index of the component. This is particularly useful for unknowns such as the Killing vectors, whose components are to be solved for from a set of equations. In this case, however, explicitly zero components must also be stored. See below for some examples of implicit objects.