code: def show_images(self, size="small"):
          
          d = dict(small=256, med=512, thumb=100, full=1024)
          try:
              width = d[size]
          except KeyError:
              print("Allowed keys:", d.keys())
              return
          img_urls = [i._get_img_url(size) for i in self.obsids]
          imagesList = "".join(
              [
                  "<img style='width: {0}px; margin: 0px; float: "
                  "left; border: 1px solid black;' "
                  "src='{1}' />".format(width, s)
                  for s in img_urls
              ]
          )
          display(HTML(imagesList))
docs: Shows preview images using the Jupyter notebook HTML display.
  
          Parameters
          ==========
          size : {'small', 'med', 'thumb', 'full'}
              Determines the size of the preview image to be shown.