and with much finer grids of 34 to 137 whose distance resolution is 25%. The data of distance-reddening relation were recently revised by @gre18. (4) @ozd16 obtained distance-reddening relations toward 46 novae based on the unique position of the red clump giants in the color-magnitude diagram. Recently, @ozd18 added the data of recent novae. (5) @chen18 presented 3D interstellar dust reddening maps of the galactic plane in three colors, $E(G - K_{\rm s})$, $E(G_{\rm BP}-G_{\rm RP})$, and $E(H - K_{\rm s})$. We use the conversion of $E(B-V)= 0.75 E(G_{\rm BP}-G_{\rm RP})$ from @chen18. The maps have a spatial angular resolution of 6 arcmin and covers the galactic longitude $0 < l < 360^\circ$ and latitude $|b| < 10^\circ$. The maps are constructed from parallax estimates from the Gaia Data Release 2 (Gaia DR2) combined with the photometry from the Gaia DR2 and the infrared photometry from the 2MASS and WISE surveys.

These five 3D dust maps often show large discrepancies (see, e.g., Figure \[distance\_reddening\_lv\_vul\_v1500\_cyg\_v1668\_cyg\_v1974\_cyg\](a)). The 3D dust maps essentially give an averaged value of a relatively broad region and thus, the pinpoint reddening could be different from it, because the resolutions of these dust maps are considerably larger than molecular 