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I work on volume reconstruction in electron microscopy. I want to convert from PDB (.ent) file to a VOL file (.vol). But to read the vol file in MATLAB, I need some information about the vol file (like size, offset, etc.). How can I get that information about the VOL file?
No, I haven't. Can you give me more information about how to use them?
Sure! A file format specification is a document that explains how data is organized and stored in a particular format. You can search for the VOL file format specification online and read it to understand the structure of the file. 

On the other hand, libvol is a library that provides a set of functions to read and write VOL files. You can download and use the library in your MATLAB code to open and manipulate VOL files. Do you want more information on how to use libvol?