code: def getKeywordList(self, kw):
          
          kwlist = []
          for chip in range(1,self._numchips+1,1):
              sci_chip = self._image[self.scienceExt,chip]
              if sci_chip.group_member:
                  kwlist.append(sci_chip.__dict__[kw])
  
          return kwlist
docs: Return lists of all attribute values for all active chips in the
          ``imageObject``.