Hi Yasser, The detailed description is in <http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/dms1.html#dmsformat

----- DMS file format: The output consists of a series of atom and surface point records, with the same format for the first six fields. Each atom is followed by the surface points (if any) which belong to it. These first six fields are in the following format: residue name, sequence number, atom name, x coordinate, y coordinate, z coordinate. For an atom record, the seventh field is "A." For a surface point record, the seventh field begins with an "S," followed by a "C," "R," or "S" according to whether the point is part of contact, reentrant, or saddle surface (saddle is a type of reentrant surface where the probe is in contact with exactly two atoms). This is followed by a digit used for depicting different density levels. The eighth field is the molecular surface area associated with the point in square angstroms. If -n is specified, the next three fields are the unit normal vector pointing outward from the surface. ----- The "0" is described as "a digit used for depicting different density levels" -- I'm guessing this was something that was used by the original MS program by Mike Connolly... maybe the file could contain multiple surfaces and that number was used to distinguish them from each other. In the files written by Chimera, I believe it is just there for compatibility with the original format and otherwise does not have a meaning. The eighth field is the estimated surface area assigned to the dot, as if the surface were divided up into separate pieces for each dot. I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab Department of Pharmaceutical Chemistry University of California, San Francisco On Nov 12, 2009, at 7:59 AM, Yasser Almeida Hernández wrote:

Hi all...

In the .dms format: 1 - What's the meaning of the digit (allways 0) after the SR (or SC, SC)? 2 - What's the meaning of the number in the 8th field?

I've read the help of this format, but i don't understand the meaning of these numbers

Thanks...