This method ensures that the green (first) channel has
the same empirical distribution across arrays, leaving the
-values (log-ratios) unchanged. This method might be used when
the green channel is a common reference throughout the experiment.
In such a case the green channel represents the same target
throughout, so it makes compelling sense to force the distribution
of intensities to be same for the green channel on all the arrays,
and to adjust to the red channel accordingly [5].
Bjørn Kåre Alsberg
2006-04-06