Constants with x_dim= 23  (correctly rounded)

  7.85398163397448309615660845819875721049292349843776455243736148076954101571552249657008706336e-1
struct xpr pi4={
0x3ffe,0xc90f,0xdaa2,0x2168,0xc234,0xc4c6,0x628b,0x80dc,0x1cd1,0x2902,
0x4e08,0x8a67,0xcc74,0x020b,0xbea6,0x3b13,0x9b22,0x514a,0x0879,0x8e34,
0x04dd,0xef95,0x19b3,0xcd3a
};

  2.71828182845904523536028747135266249775724709369995957496696762772407663035354759457138217853e+0
struct xpr ee={
0x4000,0xadf8,0x5458,0xa2bb,0x4a9a,0xafdc,0x5620,0x273d,0x3cf1,0xd8b9,
0xc583,0xce2d,0x3695,0xa9e1,0x3641,0x1464,0x33fb,0xcc93,0x9dce,0x249b,
0x3ef9,0x7d2f,0xe363,0x630c
};

  6.93147180559945309417232121458176568075500134360255254120680009493393621969694715605863326996e-1
struct xpr ln2={
0x3ffe,0xb172,0x17f7,0xd1cf,0x79ab,0xc9e3,0xb398,0x03f2,0xf6af,0x40f3,
0x4326,0x7298,0xb62d,0x8a0d,0x175b,0x8baa,0xfa2b,0xe7b8,0x7620,0x6deb,
0xac98,0x5595,0x52fb,0x4afa
};

  1.41421356237309504880168872420969807856967187537694807317667973799073247846210703885038753433e+0
struct xpr srt2={
0x3fff,0xb504,0xf333,0xf9de,0x6484,0x597d,0x89b3,0x754a,0xbe9f,0x1d6f,
0x60ba,0x893b,0xa84c,0xed17,0xac85,0x8333,0x9915,0x4afc,0x8304,0x3ab8,
0xa2c3,0xa8b1,0xfe6f,0xdc87
};