27template <Channel_t CH> g2_iw_t chi0_from_gg2(g_iw_cvt g, g2_iw_cvt g2);
44g2_iw_t chi0_from_gg2_PH(g_iw_vt g, g2_iw_vt g2);
61g2_iw_t chi0_from_gg2_PP(g_iw_vt g, g2_iw_vt g2);
63template <Channel_t CH> g2_iw_t chi_from_gg2(g_iw_cvt g, g2_iw_cvt g2);
82g2_iw_t chi_from_gg2_PH(g_iw_vt g, g2_iw_vt g2);
101g2_iw_t chi_from_gg2_PP(g_iw_vt g, g2_iw_vt g2);
116chi2_tau_t chi0_tau_from_g_tau_PH(g_tau_cvt g);