average HYCOM th3d mean: 2004.00-2013.00 [23.2H] :	   -23.929001       2.7852697    
 sea surf. height  mean: 2004.00-2013.00 [23.2H] :	  -0.53410119      0.77402765    
min,max depth =	    5.0000000       6803.6846