I don't know, at the moment, where the minimum is forced to 0 - normally
this does not happen, it is probably a bug with the multi-value series
which I don't use that much, I don't know...
Until this is fixed you have to determine the minimum of the y axis on
your own. Declare a variable "mn: Double", set it to a very large value
before you begin reading data ("mn := 1E308"), and then, each time after
adding a value to the series, compare the currently added Low-value (it
should be the smallest one of this record) with the current mn value and
update it: "if lLow < mn then mn := lLow".
At the end, use the Chart's Extent property to force the yMin to the
final result obtained for mn: "Chart1.Extent.YMin := mn". And this
setting has to be activated by setting the Extent's UseYMin to true:
"Chart1.Extent.UseYMin := true".
--
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