Set how much additional space is added above the maximum data value on the Secondary Y-Axis.
- Range: 0–1
- Default: 0.3

For example, if the maximum value in the series is 500:
- 0: no additional space is added. The axis ends at 500.
- 0.25: adds 25% of the maximum value as extra space. The axis ends at 625.
- 1: adds 100% of the maximum value as extra space. The axis ends at 1,000.
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