correlations circle between the variables of one or more matrices on the one hand; and two axes representing orthogonal scores (e.g. from a PCA or a PLSR) on the other hand
corrplot(x_scores,col1,col2,x1,(x2),...(xr))
a Div structure containing the orthogonal scores of n observations
the columns of x_scores.d chosen for the abscissa and the ordinate respectively
one or more Div structures containing measurements onto the same n observations than x_scores