Hi all, thanks in advance for the help. Can someone explain to me the following result, and what I'm doing wrong in the second case? > seq(-43.7,-43.69,.001)[3]==-43.698 [1] TRUE > seq(-43.7,-43.69,.001)[2]==-43.699 [1] FALSE > seq(-43.7,-43.69,.001)[1]==-43.7 [1] TRUE Dan