def _epd_residual2(coeffs,<EOL>times, mags, errs,<EOL>fsv, fdv, fkv, xcc, ycc, bgv, bge, iha, izd):
f = _epd_function(coeffs, fsv, fdv, fkv, xcc, ycc, bgv, bge, iha, izd)<EOL>residual = mags - f<EOL>return residual<EOL>
This is the residual function to minimize using
    scipy.optimize.least_squares.

    This variant is for :py:func:`.epd_magseries_extparams`.