bubble:
 zScaling: Boolean
 zScaling controls whether to draw the bubbles of different size (based on z value) or to draw same size bubbles (helpful in case your data-set contains values that extends to extreme ends)
  minBubbleRadius: Number
 Minimum radius size of a bubble. If a bubble value is too small to be displayed, this size will be used.
  maxBubbleRadius: Number
 Maximum radius size of a bubble. If a bubble value is too large to cover the chart, this size will be used.
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