  COMMAND WAVE2D
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    Purpose: transversal/longitudinal wave along x- and y-axis
      Usage: WAVE2D(<objectID>,<frames>,<filename>,<"T" or "L">,
                    [<amplitude>,<wavelength>,<sourceX>,<sourceY>,
                    <damping>,<phase in degrees>])
   Examples: wave2d(1,40,obj,l,12.0,24,10,-10,1.6,60.0)
             wave2d(1,60,,l)
             wave2d(1,60,ram:obj,t)
