def METHOD_NAME(self):
    """Return the inverse noise variance weights [K_CMB^-2]"""
    if self._detweights is None:
        self._detweights = {}
        for detname, detdata in self.detector_data.items():
            net = detdata["NET"]
            if "fsample" in detdata:
                fsample = detdata["fsample"]
            else:
                fsample = self.sample_rate
            detweight = 1.0 / (fsample * net ** 2)
            self._detweights[detname] = detweight
    return self._detweights