On Thu, 12 Apr 2007, in microsoft.public.excel.charting,
hmm said:

Is there any way--even by a trick--of having horizontal gridlines cross the
secondary y-axis major-unit hash marks, rather than based on the primary
axis' marks?

You can put your primary scale over on the right, and the secondary
scale on the left, which should produce the same visual effect.

--
Del Cotter
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