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This sets the allowance (default 0.8) as a fraction of the space between adjacent trace lines (determined by the major Y-ticks).
ch.Set 'ia' 0.9
This may be set to a value >1 if you have a set of lines which move along very nearly parallel to one another. However this only works well with a plain inner axis as otherwise the ticks and labels collide.
See also ...
ch.Trace trace charts
IStyle inner-axis style