X = [
    1.9400    3.7540
    2.8640    4.7500
    4.9420    6.6280
    5.6360    8.1520
    6.5120    9.2080
    8.4060   10.6160
    9.3760   11.5540
   10.5780   12.8440
   11.5940   14.9560
   13.8100   16.2460
   16.3520   16.5980
   16.2120   13.7240
   15.3340   12.4920
   14.7340   11.4960
   12.0100    9.5600
   10.5780    8.2120
    9.3760    7.0380
    9.3760    7.0380
    7.5760    4.3980
    5.8200    3.9300
    4.4800    2.9320
    3.0020    2.6980
];
