Constants with x_dim= 7 (correctly rounded)

  7.8539816339744830961566084582e-1
struct xpr pi4={
0x3ffe,0xc90f,0xdaa2,0x2168,0xc234,0xc4c6,0x628b,0x80dc
};

  2.7182818284590452353602874714e+0
struct xpr ee={
0x4000,0xadf8,0x5458,0xa2bb,0x4a9a,0xafdc,0x5620,0x273d
};

  6.9314718055994530941723212146e-1
struct xpr ln2={
0x3ffe,0xb172,0x17f7,0xd1cf,0x79ab,0xc9e3,0xb398,0x03f3
};

  1.4142135623730950488016887242e+0
struct xpr srt2={
0x3fff,0xb504,0xf333,0xf9de,0x6484,0x597d,0x89b3,0x754b
};