Corrections between USNO-B and PPMXL
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https://b2find.eudat.eu/dataset/3f0e96d9-05b4-5634-96a3-39280edffb08
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资源简介：
Differences between USNO-B and PPMXL in positions and proper motions, on an all-sky one-degree grid. At each gridpoint we give the differences X(PPMXL)- X(USNO-B1.0) averaged...
