/*
  This code can be loaded, or copied and pasted, into Magma.
  It will load the data associated to the HMF, including
  the field, level, and Hecke and Atkin-Lehner eigenvalue data.
  At the *bottom* of the file, there is code to recreate the
  Hilbert modular form in Magma, by creating the HMF space
  and cutting out the corresponding Hecke irreducible subspace.
  From there, you can ask for more eigenvalues or modify as desired.
  It is commented out, as this computation may be lengthy.
*/

P<x> := PolynomialRing(Rationals());
g := P![9, 3, -7, -1, 1];
F<w> := NumberField(g);
ZF := Integers(F);

NN := ideal<ZF | {45,15,-1/3*w^3 + 1/3*w^2 + 7/3*w - 4}>;

primesArray := [
[5, 5, -1/3*w^3 - 2/3*w^2 + 7/3*w + 4],
[5, 5, 1/3*w^3 - 4/3*w^2 - 1/3*w + 3],
[9, 3, -w],
[9, 3, 1/3*w^3 - 1/3*w^2 - 7/3*w + 1],
[16, 2, 2],
[19, 19, 2/3*w^3 - 2/3*w^2 - 11/3*w],
[19, 19, -1/3*w^3 + 1/3*w^2 + 1/3*w + 1],
[31, 31, 2/3*w^3 + 1/3*w^2 - 11/3*w - 2],
[31, 31, 2/3*w^3 - 5/3*w^2 - 5/3*w + 5],
[41, 41, -1/3*w^3 + 4/3*w^2 + 7/3*w - 6],
[41, 41, -1/3*w^3 + 4/3*w^2 + 7/3*w - 3],
[61, 61, 1/3*w^3 - 4/3*w^2 + 2/3*w + 4],
[61, 61, 2/3*w^3 + 1/3*w^2 - 14/3*w - 2],
[71, 71, -1/3*w^3 + 4/3*w^2 + 1/3*w - 7],
[71, 71, 1/3*w^3 + 2/3*w^2 - 7/3*w],
[89, 89, -1/3*w^3 + 1/3*w^2 + 10/3*w - 3],
[89, 89, 1/3*w^3 - 1/3*w^2 - 10/3*w - 1],
[101, 101, 1/3*w^3 - 1/3*w^2 - 7/3*w - 3],
[101, 101, -2/3*w^3 + 5/3*w^2 + 11/3*w - 4],
[101, 101, 2/3*w^3 - 5/3*w^2 - 8/3*w + 3],
[101, 101, w - 4],
[109, 109, 2/3*w^3 + 1/3*w^2 - 8/3*w - 4],
[109, 109, -w^3 + 2*w^2 + 4*w - 4],
[121, 11, w^3 - w^2 - 4*w + 1],
[121, 11, -w^3 + w^2 + 4*w - 2],
[131, 131, 4/3*w^3 - 1/3*w^2 - 22/3*w - 1],
[131, 131, -w^3 + 7*w + 2],
[139, 139, 2/3*w^3 - 2/3*w^2 - 14/3*w + 1],
[139, 139, 2*w - 1],
[139, 139, 1/3*w^3 + 5/3*w^2 - 7/3*w - 10],
[139, 139, -2/3*w^3 + 8/3*w^2 + 5/3*w - 5],
[149, 149, w^3 + w^2 - 7*w - 11],
[149, 149, -w^3 - w^2 + 5*w + 4],
[151, 151, -2/3*w^3 - 4/3*w^2 + 14/3*w + 5],
[151, 151, 2/3*w^3 - 8/3*w^2 - 2/3*w + 9],
[169, 13, -2/3*w^3 - 1/3*w^2 + 11/3*w],
[169, 13, -2/3*w^3 + 5/3*w^2 + 5/3*w - 7],
[179, 179, 4/3*w^3 - 7/3*w^2 - 13/3*w + 6],
[179, 179, -4/3*w^3 + 1/3*w^2 + 19/3*w + 1],
[181, 181, 5/3*w^3 - 8/3*w^2 - 20/3*w + 5],
[181, 181, -1/3*w^3 + 1/3*w^2 + 10/3*w - 1],
[181, 181, -4/3*w^3 + 1/3*w^2 + 16/3*w + 3],
[191, 191, w^2 - 3*w - 1],
[191, 191, -1/3*w^3 + 4/3*w^2 + 10/3*w - 3],
[199, 199, -w^3 + 3*w^2 + w - 7],
[199, 199, -4/3*w^3 + 1/3*w^2 + 19/3*w - 1],
[211, 211, -1/3*w^3 - 5/3*w^2 + 4/3*w + 8],
[211, 211, w^3 - 3*w^2 - 4*w + 8],
[229, 229, -4/3*w^3 + 4/3*w^2 + 13/3*w - 4],
[229, 229, -5/3*w^3 + 5/3*w^2 + 23/3*w - 5],
[229, 229, 1/3*w^3 - 7/3*w^2 + 2/3*w + 10],
[229, 229, -2/3*w^3 + 2/3*w^2 + 2/3*w - 3],
[239, 239, 4/3*w^3 - 1/3*w^2 - 19/3*w - 2],
[239, 239, -2/3*w^3 + 2/3*w^2 + 11/3*w - 6],
[251, 251, 2*w^2 - w - 8],
[251, 251, -1/3*w^3 - 2/3*w^2 + 7/3*w - 2],
[251, 251, 1/3*w^3 - 4/3*w^2 - 1/3*w + 9],
[251, 251, -1/3*w^3 + 7/3*w^2 + 1/3*w - 7],
[269, 269, -5/3*w^3 + 8/3*w^2 + 17/3*w - 8],
[269, 269, -5/3*w^3 + 11/3*w^2 + 17/3*w - 12],
[271, 271, 1/3*w^3 + 2/3*w^2 - 13/3*w - 3],
[271, 271, 1/3*w^3 + 2/3*w^2 - 13/3*w - 2],
[311, 311, -1/3*w^3 + 7/3*w^2 - 5/3*w - 8],
[311, 311, -w^3 + 5*w - 1],
[331, 331, -2/3*w^3 - 1/3*w^2 + 8/3*w + 6],
[331, 331, -w^3 + 2*w^2 + 4*w - 2],
[349, 349, -w^3 + 2*w^2 + w + 1],
[349, 349, 1/3*w^3 - 1/3*w^2 - 7/3*w - 4],
[349, 349, -4/3*w^3 + 13/3*w^2 + 10/3*w - 11],
[349, 349, w - 5],
[361, 19, -4/3*w^3 + 4/3*w^2 + 16/3*w - 3],
[379, 379, 7/3*w^3 - 1/3*w^2 - 43/3*w - 9],
[379, 379, 2*w^3 - 3*w^2 - 9*w + 8],
[401, 401, 1/3*w^3 + 2/3*w^2 - 7/3*w - 8],
[401, 401, -1/3*w^3 + 10/3*w^2 - 2/3*w - 15],
[401, 401, -4/3*w^3 + 4/3*w^2 + 13/3*w - 3],
[401, 401, -1/3*w^3 + 4/3*w^2 - 5/3*w + 3],
[409, 409, -5/3*w^3 + 8/3*w^2 + 20/3*w - 7],
[409, 409, 4/3*w^3 - 1/3*w^2 - 16/3*w - 1],
[419, 419, 4/3*w^3 - 16/3*w^2 - 1/3*w + 10],
[419, 419, 5/3*w^3 + 7/3*w^2 - 35/3*w - 17],
[421, 421, -2*w^3 + 4*w^2 + 7*w - 10],
[421, 421, -5/3*w^3 + 8/3*w^2 + 29/3*w - 7],
[421, 421, 1/3*w^3 + 2/3*w^2 + 5/3*w - 4],
[421, 421, -5/3*w^3 - 1/3*w^2 + 23/3*w + 5],
[431, 431, -2/3*w^3 + 5/3*w^2 + 11/3*w - 1],
[431, 431, -w^2 - w + 8],
[439, 439, -2/3*w^3 + 11/3*w^2 - 1/3*w - 8],
[439, 439, -2/3*w^3 + 11/3*w^2 + 8/3*w - 15],
[479, 479, w^3 + 2*w^2 - 6*w - 10],
[479, 479, -5/3*w^3 + 5/3*w^2 + 14/3*w],
[479, 479, -5/3*w^3 + 5/3*w^2 + 23/3*w - 3],
[479, 479, -4/3*w^3 + 4/3*w^2 + 13/3*w - 2],
[521, 521, -w^3 + 2*w^2 + 5*w + 1],
[521, 521, 1/3*w^3 + 2/3*w^2 - 1/3*w - 10],
[541, 541, 1/3*w^3 + 5/3*w^2 + 2/3*w - 7],
[541, 541, 5/3*w^3 - 5/3*w^2 - 26/3*w],
[569, 569, -w - 5],
[569, 569, 1/3*w^3 - 1/3*w^2 - 7/3*w + 6],
[571, 571, w^3 - 4*w - 8],
[571, 571, -1/3*w^3 + 7/3*w^2 + 7/3*w - 4],
[599, 599, 5/3*w^3 - 5/3*w^2 - 14/3*w + 4],
[599, 599, -4/3*w^3 + 13/3*w^2 + 13/3*w - 15],
[599, 599, 2*w^3 - 3*w^2 - 8*w + 5],
[599, 599, 7/3*w^3 - 7/3*w^2 - 34/3*w + 6],
[601, 601, -4/3*w^3 + 13/3*w^2 + 13/3*w - 13],
[601, 601, -w^3 + 8*w + 5],
[619, 619, -5/3*w^3 + 11/3*w^2 + 17/3*w - 13],
[619, 619, 4/3*w^3 + 2/3*w^2 - 19/3*w - 2],
[631, 631, w^3 - w^2 - 7*w + 1],
[631, 631, 3*w - 2],
[641, 641, -2/3*w^3 + 5/3*w^2 + 2/3*w - 7],
[641, 641, -1/3*w^3 + 7/3*w^2 - 5/3*w - 9],
[661, 661, -5/3*w^3 + 11/3*w^2 + 20/3*w - 9],
[661, 661, w^3 + w^2 - 4*w - 7],
[691, 691, -5/3*w^3 + 8/3*w^2 + 17/3*w - 6],
[691, 691, 2*w^2 - 3*w - 10],
[691, 691, 5/3*w^3 - 2/3*w^2 - 23/3*w - 1],
[691, 691, 1/3*w^3 + 5/3*w^2 - 13/3*w - 3],
[701, 701, 2/3*w^3 + 4/3*w^2 - 20/3*w - 11],
[701, 701, -2/3*w^3 - 1/3*w^2 + 17/3*w + 9],
[709, 709, -2/3*w^3 - 7/3*w^2 + 17/3*w + 11],
[709, 709, -1/3*w^3 + 10/3*w^2 - 2/3*w - 8],
[709, 709, -2/3*w^3 + 11/3*w^2 - 1/3*w - 10],
[709, 709, 3*w^2 - 2*w - 14],
[719, 719, 7/3*w^3 + 8/3*w^2 - 46/3*w - 21],
[719, 719, -2*w^3 + 7*w^2 + 2*w - 13],
[719, 719, 2/3*w^3 + 7/3*w^2 - 14/3*w - 9],
[719, 719, -w^3 + 4*w^2 + 2*w - 13],
[761, 761, 1/3*w^3 + 5/3*w^2 - 1/3*w - 8],
[761, 761, 5/3*w^3 - 2/3*w^2 - 14/3*w + 1],
[761, 761, -8/3*w^3 + 11/3*w^2 + 38/3*w - 11],
[761, 761, -4/3*w^3 + 10/3*w^2 + 19/3*w - 9],
[809, 809, -2/3*w^3 + 11/3*w^2 + 5/3*w - 15],
[809, 809, 3*w^2 - w - 8],
[811, 811, 2/3*w^3 + 7/3*w^2 - 14/3*w - 11],
[811, 811, 1/3*w^3 + 8/3*w^2 - 13/3*w - 10],
[811, 811, 1/3*w^3 - 10/3*w^2 + 5/3*w + 11],
[811, 811, -w^3 + 4*w^2 + 2*w - 11],
[821, 821, 2*w^3 - w^2 - 12*w - 5],
[821, 821, 1/3*w^3 + 5/3*w^2 - 7/3*w - 14],
[829, 829, -2/3*w^3 + 11/3*w^2 + 5/3*w - 10],
[829, 829, 3*w^2 - w - 13],
[839, 839, 4/3*w^3 - 1/3*w^2 - 25/3*w + 1],
[839, 839, -2/3*w^3 + 5/3*w^2 - 1/3*w - 6],
[841, 29, 5/3*w^3 - 5/3*w^2 - 20/3*w + 1],
[841, 29, -5/3*w^3 + 5/3*w^2 + 20/3*w - 4],
[859, 859, -1/3*w^3 - 8/3*w^2 + 13/3*w + 11],
[859, 859, -1/3*w^3 + 10/3*w^2 - 5/3*w - 10],
[859, 859, 2/3*w^3 - 8/3*w^2 + 1/3*w + 9],
[859, 859, -2/3*w^3 + 5/3*w^2 + 2/3*w - 8],
[881, 881, -4/3*w^3 + 16/3*w^2 + 4/3*w - 11],
[881, 881, 1/3*w^3 - 13/3*w^2 - 4/3*w + 18],
[911, 911, -1/3*w^3 + 10/3*w^2 + 1/3*w - 14],
[911, 911, -1/3*w^3 + 10/3*w^2 + 1/3*w - 9],
[929, 929, 4/3*w^3 - 7/3*w^2 - 22/3*w + 4],
[929, 929, 1/3*w^3 + 2/3*w^2 + 2/3*w - 6],
[961, 31, 5/3*w^3 - 5/3*w^2 - 20/3*w + 2],
[971, 971, -2/3*w^3 + 11/3*w^2 + 2/3*w - 13],
[971, 971, 1/3*w^3 + 8/3*w^2 - 10/3*w - 9],
[991, 991, -4/3*w^3 + 10/3*w^2 + 16/3*w - 17],
[991, 991, -2*w^3 + 4*w^2 + 11*w - 11]];
primes := [ideal<ZF | {F!x : x in I}> : I in primesArray];

heckePol := x^4 - x^3 - 13*x^2 - 3*x + 18;
K<e> := NumberField(heckePol);

heckeEigenvaluesArray := [e, -1, 1/3*e^3 - 4/3*e^2 - 7/3*e + 6, -1, -e^2 + e + 5, 1/3*e^3 - 4/3*e^2 - 1/3*e + 8, -2/3*e^3 + 5/3*e^2 + 20/3*e - 4, -e^3 + 2*e^2 + 8*e - 2, e^3 - 2*e^2 - 7*e + 4, 2/3*e^3 - 2/3*e^2 - 20/3*e - 4, -1/3*e^3 - 2/3*e^2 + 16/3*e + 2, 2/3*e^3 - 5/3*e^2 - 20/3*e + 6, -4/3*e^3 + 7/3*e^2 + 40/3*e, 1/3*e^3 - 4/3*e^2 - 19/3*e + 10, -2/3*e^3 + 8/3*e^2 + 14/3*e - 14, 2/3*e^3 + 1/3*e^2 - 26/3*e - 10, e + 6, e^3 - 2*e^2 - 11*e, 1/3*e^3 - 4/3*e^2 - 1/3*e + 10, e^3 - e^2 - 9*e, e^3 - 2*e^2 - 9*e + 12, e - 4, -e^3 + 2*e^2 + 9*e - 4, 4/3*e^3 - 4/3*e^2 - 46/3*e - 4, -2*e + 10, -1/3*e^3 + 1/3*e^2 + 7/3*e + 2, -1/3*e^3 + 4/3*e^2 + 7/3*e - 4, 5/3*e^3 - 11/3*e^2 - 47/3*e - 2, -e^3 + 4*e^2 + 5*e - 10, e^3 - 5*e^2 - 3*e + 28, 2*e^2 - 6*e - 8, -1/3*e^3 - 5/3*e^2 + 13/3*e + 14, -4/3*e^3 + 10/3*e^2 + 37/3*e - 4, -e^3 + 4*e^2 + 9*e - 14, 2/3*e^3 - 2/3*e^2 - 20/3*e, 4/3*e^3 - 7/3*e^2 - 58/3*e + 6, 2*e^3 - 6*e^2 - 14*e + 14, 2/3*e^3 - 8/3*e^2 - 17/3*e + 26, -4/3*e^3 + 7/3*e^2 + 34/3*e - 4, 5/3*e^3 - 14/3*e^2 - 35/3*e + 16, 4*e^2 - 5*e - 26, -2*e^3 + 4*e^2 + 18*e - 10, -2/3*e^3 - 4/3*e^2 + 32/3*e + 10, 5/3*e^3 - 20/3*e^2 - 17/3*e + 38, -1/3*e^3 + 4/3*e^2 + 19/3*e - 2, 7/3*e^3 - 16/3*e^2 - 49/3*e + 18, -2*e^3 + 6*e^2 + 13*e - 22, 3*e^3 - 6*e^2 - 24*e + 8, -5/3*e^3 + 17/3*e^2 + 35/3*e - 24, -7/3*e^3 + 22/3*e^2 + 49/3*e - 20, 4*e^2 - 6*e - 20, e^3 - 4*e^2 - 13*e + 22, -5/3*e^3 + 14/3*e^2 + 32/3*e - 14, 2/3*e^3 - 2/3*e^2 - 20/3*e + 8, -2/3*e^3 + 2/3*e^2 + 26/3*e - 8, 5/3*e^3 - 11/3*e^2 - 47/3*e + 20, 3*e^3 - 6*e^2 - 23*e + 18, -10/3*e^3 + 22/3*e^2 + 85/3*e - 16, e^3 - e^2 - 11*e + 6, 1/3*e^3 - 4/3*e^2 - 16/3*e - 2, 1/3*e^3 + 11/3*e^2 - 25/3*e - 28, 2*e^2 - 10*e - 20, 1/3*e^3 - 4/3*e^2 - 1/3*e + 16, e^3 - 4*e^2 - 3*e + 30, 2/3*e^3 - 2/3*e^2 - 11/3*e - 26, -e^3 + 15*e + 2, -e^3 + 2*e^2 + 5*e - 8, 8/3*e^3 - 20/3*e^2 - 74/3*e - 2, 11/3*e^3 - 26/3*e^2 - 98/3*e + 18, 2*e^3 - 6*e^2 - 12*e + 26, 2*e^3 - 4*e^2 - 20*e + 14, -2/3*e^3 - 4/3*e^2 + 23/3*e + 20, 10/3*e^3 - 16/3*e^2 - 94/3*e + 14, -5/3*e^3 + 11/3*e^2 + 47/3*e + 4, -2/3*e^3 - 10/3*e^2 + 32/3*e + 22, -7/3*e^3 + 16/3*e^2 + 37/3*e - 10, -3*e^3 + 7*e^2 + 23*e, -3*e^3 + 6*e^2 + 31*e - 8, e^3 - 3*e^2 - 7*e + 22, 5/3*e^3 - 8/3*e^2 - 77/3*e + 2, -3*e^3 + 8*e^2 + 21*e - 30, -2*e^3 + 4*e^2 + 12*e + 4, 2*e^3 - 4*e^2 - 16*e + 2, -3*e^3 + 6*e^2 + 21*e - 16, 8/3*e^3 - 14/3*e^2 - 68/3*e + 6, -8/3*e^3 + 14/3*e^2 + 86/3*e - 14, 7/3*e^3 - 16/3*e^2 - 76/3*e - 8, 2*e^3 - 6*e^2 - 20*e + 8, -4/3*e^3 + 13/3*e^2 + 22/3*e - 20, 4*e^2 - 10*e - 24, -3*e^3 + 10*e^2 + 15*e - 48, -7/3*e^3 + 1/3*e^2 + 85/3*e + 14, -5/3*e^3 + 20/3*e^2 + 14/3*e - 32, -4/3*e^3 + 4/3*e^2 + 43/3*e + 8, 7/3*e^3 - 10/3*e^2 - 85/3*e - 8, -e^3 + 4*e^2 + e - 26, 4/3*e^3 - 4/3*e^2 - 67/3*e - 10, 1/3*e^3 + 11/3*e^2 - 31/3*e - 32, -5/3*e^3 + 14/3*e^2 + 29/3*e - 20, -11/3*e^3 + 26/3*e^2 + 110/3*e - 16, -5*e - 2, -1/3*e^3 + 10/3*e^2 + 1/3*e - 10, -1/3*e^3 - 5/3*e^2 + 19/3*e + 26, -4/3*e^3 + 22/3*e^2 + 13/3*e - 46, 7/3*e^3 - 28/3*e^2 - 19/3*e + 52, -4/3*e^3 + 16/3*e^2 + 10/3*e - 38, -5/3*e^3 + 14/3*e^2 + 35/3*e - 36, 3*e^3 - 6*e^2 - 25*e + 14, -3*e^3 + 10*e^2 + 20*e - 28, 2*e^3 - 10*e^2 - 6*e + 44, -4/3*e^3 + 10/3*e^2 + 16/3*e - 8, -2/3*e^3 + 2/3*e^2 + 56/3*e - 14, 10/3*e^3 - 22/3*e^2 - 112/3*e + 22, -3*e^3 + 12*e^2 + 11*e - 56, -e^3 + 6*e^2 + 9*e - 50, -2*e^3 + 22*e + 8, -11/3*e^3 + 26/3*e^2 + 80/3*e - 36, -5/3*e^3 + 8/3*e^2 + 59/3*e - 30, -8/3*e^3 + 14/3*e^2 + 101/3*e + 6, 4*e^3 - 10*e^2 - 26*e + 36, -5/3*e^3 + 2/3*e^2 + 65/3*e + 4, -e^3 - 2*e^2 + 8*e + 34, 14/3*e^3 - 44/3*e^2 - 104/3*e + 48, -e^3 + 17*e + 16, 3*e^3 - 12*e^2 - 19*e + 46, 2*e^2 - 9*e - 6, -8/3*e^3 + 23/3*e^2 + 62/3*e - 8, -5/3*e^3 + 17/3*e^2 + 71/3*e - 32, 1/3*e^3 + 8/3*e^2 - 7/3*e - 38, -e^3 + 9*e + 30, 7/3*e^3 - 28/3*e^2 - 25/3*e + 28, 8/3*e^3 - 14/3*e^2 - 53/3*e - 4, 7/3*e^3 - 37/3*e^2 - 43/3*e + 64, -10/3*e^3 + 22/3*e^2 + 67/3*e - 10, -8/3*e^3 + 20/3*e^2 + 56/3*e - 14, 3*e^3 - 10*e^2 - 17*e + 28, -2*e + 16, 14/3*e^3 - 26/3*e^2 - 140/3*e + 18, -2*e^3 + 2*e^2 + 24*e + 22, -11/3*e^3 + 17/3*e^2 + 119/3*e + 4, -5*e^3 + 14*e^2 + 39*e - 48, 4/3*e^3 + 2/3*e^2 - 58/3*e - 22, 6*e^3 - 12*e^2 - 52*e + 16, -2/3*e^3 + 8/3*e^2 + 20/3*e - 20, -7/3*e^3 + 16/3*e^2 + 73/3*e - 10, -5/3*e^3 + 14/3*e^2 + 53/3*e - 4, -11/3*e^3 + 20/3*e^2 + 98/3*e + 2, -8/3*e^3 + 17/3*e^2 + 44/3*e - 12, e^3 + 4*e^2 - 21*e - 34, 1/3*e^3 - 22/3*e^2 + 41/3*e + 38, 2*e^3 - 7*e^2 - 16*e - 2, -7/3*e^3 + 16/3*e^2 + 25/3*e - 4, 8/3*e^3 - 29/3*e^2 - 50/3*e + 26, e^3 - 9*e - 6, -1/3*e^3 + 13/3*e^2 + 19/3*e - 58, 3*e^3 - 14*e^2 - 13*e + 84, 12*e - 18, -2/3*e^3 + 17/3*e^2 + 26/3*e - 54, -13/3*e^3 + 28/3*e^2 + 139/3*e - 22, -11/3*e^3 + 23/3*e^2 + 107/3*e - 2, 4*e^3 - 16*e^2 - 30*e + 68, e^3 + 4*e^2 - 19*e - 34];
heckeEigenvalues := AssociativeArray();
for i := 1 to #heckeEigenvaluesArray do
  heckeEigenvalues[primes[i]] := heckeEigenvaluesArray[i];
end for;

ALEigenvalues := AssociativeArray();
ALEigenvalues[ideal<ZF | {5,5,-1/3*w^3 + 4/3*w^2 + 1/3*w - 3}>] := 1;
ALEigenvalues[ideal<ZF | {9,3,-1/3*w^3 + 1/3*w^2 + 7/3*w - 1}>] := 1;

// EXAMPLE:
// pp := Factorization(2*ZF)[1][1];
// heckeEigenvalues[pp];

print "To reconstruct the Hilbert newform f, type
  f, iso := Explode(make_newform());";

function make_newform();
 M := HilbertCuspForms(F, NN);
 S := NewSubspace(M);
 // SetVerbose("ModFrmHil", 1);
 NFD := NewformDecomposition(S);
 newforms := [* Eigenform(U) : U in NFD *];

 if #newforms eq 0 then;
  print "No Hilbert newforms at this level";
  return 0;
 end if;

 print "Testing ", #newforms, " possible newforms";
 newforms := [* f: f in newforms | IsIsomorphic(BaseField(f), K) *];
 print #newforms, " newforms have the correct Hecke field";

 if #newforms eq 0 then;
  print "No Hilbert newform found with the correct Hecke field";
  return 0;
 end if;

 autos := Automorphisms(K);
 xnewforms := [* *];
 for f in newforms do;
  if K eq RationalField() then;
   Append(~xnewforms, [* f, autos[1] *]);
  else;
   flag, iso := IsIsomorphic(K,BaseField(f));
   for a in autos do;
    Append(~xnewforms, [* f, a*iso *]);
   end for;
  end if;
 end for;
 newforms := xnewforms;

 for P in primes do;
  xnewforms := [* *];
  for f_iso in newforms do;
   f, iso := Explode(f_iso);
   if HeckeEigenvalue(f,P) eq iso(heckeEigenvalues[P]) then;
    Append(~xnewforms, f_iso);
   end if;
  end for;
  newforms := xnewforms;
  if #newforms eq 0 then;
   print "No Hilbert newform found which matches the Hecke eigenvalues";
   return 0;
  else if #newforms eq 1 then;
   print "success: unique match";
   return newforms[1];
  end if;
  end if;
 end for;
 print #newforms, "Hilbert newforms found which match the Hecke eigenvalues";
 return newforms[1];

end function;