<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _taper2coeffs(self, alpha):
 """ Return the spherical harmonic coefficients of the unrotated Slepian function i as an array, where i = 0 is the best concentrated function. """

        taperm = self.orders[alpha]
        coeffs = _np.zeros((2, self.lmax + 1, self.lmax + 1))
        if taperm < 0:
            coeffs[1, :, abs(taperm)] = self.tapers[:, alpha]
        else:
            coeffs[0, :, abs(taperm)] = self.tapers[:, alpha]

        return coeffs