Hi. I am using the ripley multivariate function Lcross to caracterise the spatial interactions of two factors using monte carlo simulation. envelope(B1, Lcross, nsim=100, rank=1, global=TRUE)->E1 My problem is that My confidence Interval (CI) is not parallel to the X axis when I plot the result like this : plot(E1, ylim=c(-589, 2947), xlim=c(0, 503), main = "Lsc_ss(r): Zone Makan", xlab = "Distance r(m) ", ylab = " Lsc_ss(r) ", font.main=3, font.axis=1.2, font.lab=1.2, col=c(1,1,1,1), lty=c(1,3,2,2), lwd=2, cex.lab=1.2, cex.axis=1.2). Can someone help me. thanks _____ I am using the Free version of SPAMfighter for Personal use. SPAMfighter has removed 44 of my spam emails to date. Try SPAMfighter <http://www.spamfighter.com/len> for free now! The Trial and Professional version does not have this message in the email [[alternative HTML version deleted]]