docs: def sinwave(n=4,inc=.25):
  	"""
  	Returns a DataFrame with the required format for 
  	a surface (sine wave) plot
  
  	Parameters:
  	-----------
  		n : int
  			Ranges for X and Y axis (-n,n)
  		n_y : int
  			Size of increment along the axis
  	"""	
  	x=np.arange(-n,n,inc)
  	y=np.arange(-n,n,inc)
  	X,Y=np.meshgrid(x,y)
  	R = np.sqrt(X**2 + Y**2)
  	Z = np.sin(R)/(.5*R)
  	return pd.DataFrame(Z,index=x,columns=y)