coefficients de l'enfoncement isostatique de Philippe Huybrechts
        A diviser par 11030 de facon a ce que la somme soit 1
        puis par rom et par g
         bloc de 21 x 21  (-10:10,-10:10)

     -1,0,0,1,2,3,4,6,7,7,7,7,7,6,4,3,2,1,0,0,-1
     0,0,1,3,4,6,8,9,10,12,12,12,10,9,8,6,4,3,1,0,0
     0,1,3,5,7,9,12,14,16,17,18,17,16,14,12,9,7,5,3,1,0
     1,3,5,7,10,14,18,21,23,26,26,26,23,21,18,14,10,7,5,3,1
     2,4,7,10,15,19,24,29,33,35,36,35,33,29,24,19,15,10,7,4,2
     3,6,9,14,19,25,31,36,42,46,48,46,42,36,31,25,19,14,9,6,3
     4,8,12,18,24,31,40,48,54,59,62,59,54,48,40,31,24,18,12,8,4
     6,9,14,21,29,36,48,58,67,74,77,74,67,58,48,36,29,21,14,9,6
     7,10,16,23,33,42,54,67,79,88,92,88,79,67,54,42,33,23,16,10,7
     7,12,17,26,35,46,59,74,88,99,106,99,88,74,59,46,35,26,17,12,7
     7,12,18,26,36,48,62,77,92,106,114,106,92,77,62,48,36,26,18,12,7
     7,12,17,26,35,46,59,74,88,99,106,99,88,74,59,46,35,26,17,12,7
     7,10,16,23,33,42,54,67,79,88,92,88,79,67,54,42,33,23,16,10,7
     6,9,14,21,29,36,48,58,67,74,77,74,67,58,48,36,29,21,14,9,6
     4,8,12,18,24,31,40,48,54,59,62,59,54,48,40,31,24,18,12,8,4
     3,6,9,14,19,25,31,36,42,46,48,46,42,36,31,25,19,14,9,6,3
     2,4,7,10,15,19,24,29,33,35,36,35,33,29,24,19,15,10,7,4,2
     1,3,5,7,10,14,18,21,23,26,26,26,23,21,18,14,10,7,5,3,1
     0,1,3,5,7,9,12,14,16,17,18,17,16,14,12,9,7,5,3,1,0
     0,0,1,3,4,6,8,9,10,12,12,12,10,9,8,6,4,3,1,0,0
     -1,0,0,1,2,3,4,6,7,7,7,7,7,6,4,3,2,1,0,0,-1