To the best of my knowledge, that isn't supported. (although you claimed
you achieved what you want manually)

Perhaps you want to use a logarithmic scale.

--
Regards,
Tom Ogilvy


Alan Pong <no_spam_please wrote in message
...
Tom, thanks for suggestion (using CLng).
yes, your sub-routine shows a curve with x-scale like this:
p1----p2----p3----p4


however, what i want the x-scale is, like this:
p1---p2-------p3---------------p4

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