How to make a size wave for the scatter plot in Gizmo?

Hi all,

If I would like to mark the spheres in Gizmo with a size wave, how could I manage that?
https://www.wavemetrics.com/products/igorpro/creatinggraphs/3dandvolume…

Best regards,
Peter
DisplayHelpTopic "ModifyGizmo for Scatter Objects"

property={sizeWave, wave }
wave is a 2D 3 column wave specifying the marker size for each scatter point. The three columns contain the scaling factors in the X, Y and Z directions respectively.
A size of 1 corresponds to a sphere that occupies most of the display volume. Typically, scatter objects are best represented by significantly smaller values.