Functions for drawing ellipses and ellipse-like confidence
regions
Duncan Murdoch <murdoch@stats.uwo.ca> and E. D. Chow (porting
        to R by Jesus M. Frias Celayeta <iosu@bureau.ucc.ie>)
This package contains various routines for drawing
        ellipses and ellipse-like confidence regions, implementing the
        plots described in Murdoch and Chow (1996), A graphical display
        of large correlation matrices, The American Statistician 50,
        178-180. There are also routines implementing the profile plots
        described in Bates and Watts (1988), Nonlinear Regression
        Analysis and its Applications.