code: def check_label(self):
          
          if not self.is_ring_data:
              return
          targetname = getkey(
              from_=self.pm.raw_cub, grp="instrument", keyword="targetname"
          )
  
          if targetname.lower() != "saturn":
              editlab(
                  from_=self.pm.raw_cub,
                  options="modkey",
                  keyword="TargetName",
                  value="Saturn",
                  grpname="Instrument",
              )
docs: Check label for target and fix if necessary.
  
          Forcing the target name to Saturn here, because some observations of
          the rings have moons as a target, but then the standard map projection
          onto the Saturn ring plane fails.
  
          See also
          --------
          https://isis.astrogeology.usgs.gov/IsisSupport/index.php/topic,3922.0.html