fix spec sim bug

            BoolDeadPix = False

        # Add sky background

        if sky_map == None:

        if sky_map is None:

            sky_map = filt.getSkyNoise(exptime=self.exptime)

        elif img.array.shape != sky_map.shape:

            raise ValueError("The shape img and sky_map must be equal.")

            pointing_ID=pointing_ID,

            timestamp_obs=timestamp_obs,

            pointing_type=pointing_type,

            sky_map=sky_map)

            sky_map=sky_map, tel = self.tel)

        if pointing_type == 'MS':

            datetime_obs = datetime.fromtimestamp(timestamp_obs)