  The approach to heteroscedasticity of ref.1(Instruments 2022, 6(1), 10)
contains a sketchy application of a sub-optimal method of very easy
implementation: the lucky model. The supporting proof of this method could not
be inserted in ref.1. The proof requires the analytical forms of the
probability of ref.2 for the two strip center of gravity. However, those
analytical forms suggest also a completion of the lucky-model for the absence
of a scaling constant, relevant for combinations of different detector types.
The advanced lucky-model (the super-lucky model) can be directly used for track
fitting in trackers composed of non-identical detectors. The construction of
the weights for the fits is very simple. Simulations of track fitting with this
upgraded tool show resolution improvements also for combination of two types of
very different detectors, near to the resolutions of the schematic model of
ref.1.
