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For example, you can see that OGLE 2003-BLG-235 is the farthest from earth, and the one closest to the center of the Milky Way compared with other known exoplanet-hosting stars.
The logarithmic property of the map is best understood by taking note of the labels on the left side of the map, where the units increase from kilometers, to AU, to parsec, to kiloparsec, all the way to megaparsec--from the bottom-up of the long strip of map, to denote the distances when you look up the sky as you stand on the surface of the earth.
Links:
Logarithmic Maps of the Universe
Going Up? (Starts with a Bang)
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