usage: prog <classes file> <output> [options]
Extracts particles associated with specific class-averages and combines them into a new stack/vstack

Option Type Description
--version None show program's version number and exit
--vstack None Will output to a bdb virtual stack instead of copying the image data. Input images must have been BDB for this to work.
--classes str Comma separated list of class-numbers to extract particles for
--ppid int Set the PID of the parent process, used for cross platform PPID