exportPattern("^[[:alpha:]]+")
importFrom(stats, approx, complete.cases, ecdf, median, rchisq, rexp,rlnorm, rnorm, runif)
importFrom(graphics, abline, contour, image, legend, lines, mtext, persp, plot, title) 
importFrom(grDevices, colorRampPalette, dev.new, dev.off, rainbow)
