mine:
(gdb) print f1
$1 = {0, 1, -0.29284057, 4.97879839, -1.16318476, 9.93650246, -1.74071467}
(gdb) print f2
$2 = {0, 1, -0.0497754961, 4.93780422, -0.196741089, 9.81402493, -0.293937504}


// f'
(gdb) print f1
$3 = {0, 1, 0.7071594, 4.68595791, 3.81561375, 8.77331734, 8.19578743}
(gdb) print f2
$4 = {0, 1, -1.04977548, 4.98757982, -5.13454533, 10.010766, -10.1079626}



theirs:
(gdb) print f1
$1 = {16777216, -32914432, 54602988, -70994468, 86818668, -88894336}
={1, -1.96185303, 3.2545917, -4.23160005, 5.17479587, -5.29851532}
(gdb) print f2
$2 = {16777216, -2139136, 25914196, -4387236, 30934928, -5232900}
={1, -0.127502441, 1.54460645, -0.261499643, 1.84386539, -0.311905146}

// f'
(gdb) print f1
$3 = {16777216, -16137216, 21688556, -16391480, 15824200, -2075668}
={1, -0.96185302, 1.29273867, -0.97700834, 0.94319581, -0.12371945}
(gdb) print f2
$4 = {16777216, -18916352, 28053332, -30301432, 35322164, -36167828}
={1, -1.12750244, 1.67210888, -1.80610609, 2.10536503, -2.15577054}