actually, my cut and paste of the bvecs file was not perfect. Here is the actual content of the bvecs file:
0.000000 0.000000 1.000000
0.000000 0.000000 -1.000000
0.000000 1.000000 0.000000
0.000000 -1.000000 0.000000
1.000000 0.000000 0.000000
-1.000000 0.000000 0.000000
0.500000 0.309017 0.809017
0.809017 0.500000 0.309017
0.309017 0.809017 0.500000
0.525731 0.850651 0.000000
0.809017 0.500000 -0.309017
0.500000 0.309017 -0.809017
0.309017 0.809017 -0.500000
0.000000 0.525731 0.850651
-0.500000 0.309017 0.809017
-0.309017 0.809017 0.500000
-0.809017 0.500000 0.309017
0.000000 0.525731 -0.850651
-0.525731 0.850651 0.000000
-0.309017 0.809017 -0.500000
-0.500000 0.309017 -0.809017
-0.809017 0.500000 -0.309017
0.850651 0.000000 0.525731
0.500000 -0.309017 0.809017
0.309017 -0.809017 0.500000
0.809017 -0.500000 0.309017
0.525731 -0.850651 0.000000
0.309017 -0.809017 -0.500000
0.500000 -0.309017 -0.809017
0.809017 -0.500000 -0.309017
0.850651 0.000000 -0.525731
0.000000 -0.525731 0.850651
-0.309017 -0.809017 0.500000
-0.500000 -0.309017 0.809017
-0.809017 -0.500000 0.309017
-0.850651 0.000000 0.525731
0.000000 -0.525731 -0.850651
-0.850651 0.000000 -0.525731
-0.500000 -0.309017 -0.809017
-0.309017 -0.809017 -0.500000
-0.809017 -0.500000 -0.309017
-0.525731 -0.850651 0.000000