1d_itebd, 2d_dmrg: J, M_{zz}, M_{x}
1d_mag_Xs, 1d_mag_ZZs, 1d_mag_abs_Zs: J, N = 16, N = 32, N = 64, N = 128, N = 256, N = 512, N = 1024
2d_mag_Xs, 2d_mag_ZZs, 2d_mag_abs_Zs: J, N = 4x4, N = 6x6, N = 8x8, N = 12x12, N = 16x16, N = 24x24, N = 32x32