Comparison of bump parameters for MW (blue circles), LMC average (navy circles), and LMC2 Supershell (green circles); BAL quasars (pink squares), and two cases in literature (brown triangles) with intrinsic 2175 Å bump features, and SDSS J1630+3119 (red filled stars). For visual clarity, the error bars on the MW, LMC average, and LMC2 Supershell bumps are not displayed. The bump in SDSS J1630+3119 is relatively closer to those in the MW, and they share a similar absorption strength and width, but the bump peak in SDSS J1630+3119 is located at a longer wavelength than the galactic interstellar curves. By contrast, the bumps in the LMC average, LMC2 Supershell, BAL quasars, and the other two cases present broader absorption features with more disordered peak positions and weaker absorption strengths. The results of the two analogues are also shown by open red stars.