Low emittance muon beams are central to the development of a Muon
Collider and can significantly enhance the performance of a Neutrino Factory. The international Muon Ionization Cooling Experiment (MICE) was designed to demonstrate and
study the cooling of muon beams. Several million individual muon tracks have been recorded passing through
a liquid hydrogen or a lithium hydride absorber. Beam sampling routines were employed to account for
imperfections in beam matching at the entrance into the cooling channel and enable an improvement of the
cooling performance measurement. A study of the change in normalized transverse emittance in a flipped polarity magnetic
field configuration is presented in this paper and the characteristics of the cooling effect are discussed.