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Radial Acceleration Relation
The dark matter contribution to the total acceleration of a galaxy can be seen as the difference between the total acceleration of a galaxy g and the contribution due only to the baryonic matter g$b$. In the first analyses it was thought that g, and therefore the dark matter contribution to it, was a universal function of g$b$ only. However a later work and 72 Low Surface Brightness (LSB) galaxies determined a relation, called GGBX relation. The GGBX makes evident how the total acceleration of a galaxy g depends, not only on the baryonic acceleration g$b$, but also on other quantities that differ from galaxy to galaxy. These quantities are the baryonic fraction, the Hubble type of the galaxy and the normalised radius with respect to the optical radius R$opt$. The GGBX deviates from the Newtonian relation at larger galactocentric distance and from the previous result at smaller galactocentric distance.