-2.500    -0.99959304798255
    -2.000    -0.99532226501895
    -1.500    -0.96610514647531
    -1.000    -0.84270079294971
    -0.500    -0.52049987781305
     0.000     0.00000000000000
     0.500     0.52049987781305
     1.000     0.84270079294971
     1.500     0.96610514647531
     2.000     0.99532226501895
     2.500     0.99959304798255