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Radius
                                          db     Radius/2 (x),Radius/2 (y)

The collision area of a single sprite can be changed in size and shape. Usually, a single sprite's collision area is:

                                          db 4,4                        ; radius/2

The reason for these values is: both X and Y coordinates have to be input halved, and since 1/2 it's 8,8 and given a standard center at 4,4, then a 16x16 pixel sprite has a collision area with radius 4,4.

See also:
Alien
Center

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