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YDatum – Y-datum lines

To set one or more horizontal datum lines:

ch.Set 'Ydatum' VEC

... where this is any list of numbers within the vertical chart range – the Y­range will automatically be extended to include them.

The datum-line setting is automatically cleared once they have been drawn on a chart – if you want the same lines applied to a secondary plot, you will need to reset the property.

Continue to: YFactor – Y-axis scale factor
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