The signal-to-noise_map of the data and noise-map which are fitted.

def signal_to_noise_map(self):
        """The signal-to-noise_map of the data and noise-map which are fitted."""
        signal_to_noise_map = np.divide(self.data, self.noise_map)
        signal_to_noise_map[signal_to_noise_map < 0] = 0
        return signal_to_noise_map