	// Slice2 addresses a 2D subdata set of img. 
		// The first number triplet specifies a sampling starting point as X/Y/Z
		// the second number triplet specifies a sampling direction, sampling lenght and sampling step size for the first output dimension 
		// the third number triplet specifies a sampling direction, sampling lenght and sampling step size for the second output dimension
		BImg += slice2( img, x, y, 0, 0, l0,s0, 1, l1,s1)
			
					
				