Shepard's interpolation for different power parameters p, from scattered points on the surface 
  
    
      
        z
        =
        exp
        ⁡
        (
        −
        
          x
          
            2
          
        
        −
        
          y
          
            2
          
        
        )
      
    
    {\displaystyle z=\exp(-x^{2}-y^{2})}