They are listed here. A description is added following each keyword.
Any positive value sets the number of additional iterations.
In each of these iterations the contributions from stellar neighbours are subtracted using the empirical one-dimensional point spread function. Divides objects into bright and faint for classification purposes. Should be close to the magnitude corresponding to the beginning of saturation effects. Parameter, which helps to remove spurious faint components of large bright objects. May modify central parts of real objects.