docs: def mag_to_fnu(self, mag):
          """Compute F_ν for an MKO IR filter band. There are some problems here since
          "MKO" is filters, not a photometric system, but people try to make
          Vega = 0.
  
          """
          return cgs.cgsperjy * self._zeropoints[self.band] * 10**(-0.4 * mag)