here's the center angle of each pixel ( + then - to go from biggest to
        smallest angle)  (e.g. 94.5 deg to 85.5 deg. -- sweeping left to right)

def arbanglemap(self):
        '''
        here's the center angle of each pixel ( + then - to go from biggest to
        smallest angle)  (e.g. 94.5 deg to 85.5 deg. -- sweeping left to right)
        '''
        # raySpacingDeg = self.arbfov / self.nCutPix
        maxAng = self.boresightEl + self.arbfov / 2
        minAng = self.boresightEl - self.arbfov / 2
        angles = np.linspace(maxAng, minAng, num=self.ncutpix, endpoint=True)
        assert np.isclose(angles[0], maxAng) & np.isclose(angles[-1], minAng)
        return angles