XYZRC is the extension of xyz, which store only the locations of a 3D-points set.
 

The first line of XYZRC is an integer that tell Particleview how many atoms are there in the atom set.

Just as the name of it discribing, for each of the atom, we store a five-dimension data。

(X,Y,Z,R,C)

The first three dimension X Y Z are the standard 3D orthogonal coordinates.

The fouth dimension R is the radius of this kind of atom which must be a positive float number.

The fifth dimension C is the color of this kind of atom which must be a float number. This float number can be either positive or negative because we will map all this float numbers in to the colormap to find out the exactly color to represent this kind of atom.