Constants with x_dim= 11 (correctly rounded)

  7.85398163397448309615660845819875721049292350e-1
struct xpr pi4={
0x3ffe,0xc90f,0xdaa2,0x2168,0xc234,0xc4c6,0x628b,0x80dc,0x1cd1,0x2902,
0x4e08,0x8a68
};

  2.71828182845904523536028747135266249775724709e+0
struct xpr ee={
0x4000,0xadf8,0x5458,0xa2bb,0x4a9a,0xafdc,0x5620,0x273d,0x3cf1,0xd8b9,
0xc583,0xce2d
};

  6.93147180559945309417232121458176568075500134e-1
struct xpr ln2={
0x3ffe,0xb172,0x17f7,0xd1cf,0x79ab,0xc9e3,0xb398,0x03f2,0xf6af,0x40f3,
0x4326,0x7299
};

  1.41421356237309504880168872420969807856967188e+0
struct xpr srt2={
0x3fff,0xb504,0xf333,0xf9de,0x6484,0x597d,0x89b3,0x754a,0xbe9f,0x1d6f,
0x60ba,0x893c
};