Constants with x_dim= 19 (correctly rounded)

  7.8539816339744830961566084581987572104929234984377645524373614807695410157155e-1
struct xpr pi4={
0x3ffe,0xc90f,0xdaa2,0x2168,0xc234,0xc4c6,0x628b,0x80dc,0x1cd1,0x2902,
0x4e08,0x8a67,0xcc74,0x020b,0xbea6,0x3b13,0x9b22,0x514a,0x0879,0x8e34
};

  2.7182818284590452353602874713526624977572470936999595749669676277240766303535e+0
struct xpr ee={
0x4000,0xadf8,0x5458,0xa2bb,0x4a9a,0xafdc,0x5620,0x273d,0x3cf1,0xd8b9,
0xc583,0xce2d,0x3695,0xa9e1,0x3641,0x1464,0x33fb,0xcc93,0x9dce,0x249b
};

  6.9314718055994530941723212145817656807550013436025525412068000949339362196969e-1
struct xpr ln2={
0x3ffe,0xb172,0x17f7,0xd1cf,0x79ab,0xc9e3,0xb398,0x03f2,0xf6af,0x40f3,
0x4326,0x7298,0xb62d,0x8a0d,0x175b,0x8baa,0xfa2b,0xe7b8,0x7620,0x6dec
};

  1.4142135623730950488016887242096980785696718753769480731766797379907324784621e+0
struct xpr srt2={
0x3fff,0xb504,0xf333,0xf9de,0x6484,0x597d,0x89b3,0x754a,0xbe9f,0x1d6f,
0x60ba,0x893b,0xa84c,0xed17,0xac85,0x8333,0x9915,0x4afc,0x8304,0x3ab9
};