-2 ->  0,  0.0000000000000000e+00
 -1.9 -> -0, -0.0000000000000000e+00
 -1.5 -> -0, -0.0000000000000000e+00
 -1.1 -> -0, -0.0000000000000000e+00
   -1 ->  0,  0.0000000000000000e+00
 -0.9 -> -0, -0.0000000000000000e+00
 -0.5 -> -0, -0.0000000000000000e+00
 -0.1 -> -0, -0.0000000000000000e+00
    0 ->  0,  0.0000000000000000e+00