I added a new option ('cplot' related) for to the coldmap function in nclust. The default gives the exact same result as before, but now the user can optionally specify his own plotting function. This makes easy to add arbitrary additional annotations to those top panels, like a skatterplot smoother, or highlighting some points in some way (which are things one often wants to do). I've added an example to the coldmap manpage to illustrate the new option.