Assoc Type Exposures WFPC2 Reduction Pipeline
0 a single exposure, not a real association (it was not possible to associate this with any other exposure) OTF of the exposure
1 2 or more G exposures
(in other words: no P exposures are available in these associations)
OTF of all the exposures
2 1 Single P exposure
(+ 0 or more G exposures)
OTF of all the exposures
3 N perfectly aligned P exposures
(+ 0 or more G exposures)
OTF + CR Rejection
4 N groups of M perfectly aligned P exposures
(+ 0 or more G exposures)
OTF + CR Rejection and Coaddition (Drizzling) of all the exposures
5 N' groups of M perfectly aligned
+ N'' sparse P exposures
(+ 0 or more G exposures)
OTF + CR Rejection and Coaddition (Drizzling) of the N' x M exposures
and OTF of the N'' sparse exposures
6 N'' sparse P exposures
(+ 0 or more G exposures)
OTF of all the exposures