code: def zoom_in_pixel(self, curr_pixel):
          
          low_frag = curr_pixel[0]
          high_frag = curr_pixel[1]
          level = curr_pixel[2]
          if level > 0:
              str_level = str(level)
              low_sub_low = self.spec_level[str_level]["fragments_dict"][
                  low_frag
              ]["sub_low_index"]
              low_sub_high = self.spec_level[str_level]["fragments_dict"][
                  low_frag
              ]["sub_high_index"]
              high_sub_low = self.spec_level[str_level]["fragments_dict"][
                  high_frag
              ]["sub_low_index"]
              high_sub_high = self.spec_level[str_level]["fragments_dict"][
                  high_frag
              ]["sub_high_index"]
              vect = [low_sub_low, low_sub_high, high_sub_low, high_sub_high]
              new_pix_low = min(vect)
              new_pix_high = max(vect)
              new_level = level - 1
              new_pixel = [new_pix_low, new_pix_high, new_level]
          else:
              new_pixel = curr_pixel
          return new_pixel
docs: return the curr_frag at a higher resolution