Setting particleSet file

This file stores the initial particle location and each particle size. Initial line need to be x y z dp (again, the separation is tab) and from next lines, you can give the particle initial positions and diameters. When the first particle is start from $(x, y, z) = (0, 0, 0)$ and second is $(x, y, z) = (1, 1, 1)$ and the particle diameters are 100 nm and 200 nm, it is expressed as

x y z dp
0 0 0 1e-7
1 1 1 2e-7 
...