def _load(self, scale=1.0):
        """Load the MetImage RSR data for the band requested"""
        data = np.genfromtxt(self.requested_band_filename,
                             unpack=True,
                             names=['wavenumber',
                                    'response'],
                             skip_header=4)

        # Data are wavenumbers in cm-1:
        wavelength = 1. / data['wavenumber'] * 10000.
        response = data['response']

        # The real MetImage has 24 detectors. However, for now we store the
        # single rsr as 'detector-1', indicating that there will be multiple
        # detectors in the future:
        detectors = {}
        detectors['det-1'] = {'wavelength': wavelength, 'response': response}
        self.rsr = detectors
Load the MetImage RSR data for the band requested