As initial condition an equal-weight combination of spin up and
down has been considered
Diagonal density matrix elements : contour lines are taken at
ten different heights : 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.
Different colours indicate different heights. Times and parameters
are also indicated in the pictures.
Non diagonal density matrix elements : contour lines are taken at
five different heights : 0.0001, 0.001, 0.01, 0.1, 1.
Different colours indicate different heights. Times and parameters
are also indicated in the pictures
