In a message dated 7/23/2011 6:43:17 A.M. Central Daylight Time, grierson@melbpc.org.au writes: John, Further to my previous, I have drafted an L21 modal, which you will find in the L21 section of Excel Chart 1d at: http://www.shade.id.au/Grierson/GriersonDNA.htm Discussion welcome. I've got a few minor differences in a tentative L21 modal but I could be wrong too. I notice you left some blank too which is probably a good thing. I just eyeballed the L21 site and did a rough modal. Some were too close to call. at 533 I had 13 for L21. At 714 I had 26 for L21. Those were the only differences I had. at 513 you have no value for L21. I had 12 which if correct would make the M222 value of 13 off modal. At 712 you have no value. I had 20 for L21 which in M222 is modal at 21. But that's one that's barely modal (fast moving) so it may mean nothing at all. John