docstr: Has an effect only if `marker.size` is set to a numerical
  array. Sets the scale factor used to determine the rendered
  size of marker points. Use with `sizemin` and `sizemode`.
  
  The 'sizeref' property is a number and may be specified as:
    - An int or float
  
  Returns
  -------
  int|float
code: def sizeref(self):
      """
      Has an effect only if `marker.size` is set to a numerical
      array. Sets the scale factor used to determine the rendered
      size of marker points. Use with `sizemin` and `sizemode`.
  
      The 'sizeref' property is a number and may be specified as:
        - An int or float
  
      Returns
      -------
      int|float
      """
      return self["sizeref"]
  
imports: from plotly.basedatatypes import BaseTraceHierarchyType
  import copy
label_desc: Use image node_id 45 for calling the Marker obj's underlying member method code with example usage: obj.sizeref() and returns: self