Dear Gregorio :
 In siesta,according to the manual,in order to get the DOS and PDOS,one has to 
set a ProjectedDensityOfStates block.In the block, one also need to set the 
energies of the range, the peak width for broadening the eigenvalues,the number 
of points in the energy window, and the energy units.So the peak width for 
broadening the eigenvalues is ambiguous.
 And the I think Atomic CoordinatesOrigin block is just a vector to have all 
the atoms gird shifted!

 Best wishes!

Responder a