Yes, Alan, and of course, Ian; Thank you so much for those plots given to us during the holidays showing what certainly appears to be the on-axis curves of the M50 and M60, they are greatly appreciated, and without question most helpfull. But, plots are like potato chips; nobody can digest just one. So, uh.. er.. is the whole family of plots available? (Wow, that's a lot to ask for, innit?)