psiphi
    Function
    Description
Calculates the psi and phi torsion angles around the alpha carbons (CA)
in (a specified stretch of) a specified chain of a protein structure
from the co-ordinates of the mainchain atoms in the two planes around it
    Algorithm
    Usage
    Command line arguments
    Input file format
psiphi reads ...
    Output file format
psiphi 
outputs ...
    Data files
    Notes
None.
    References
None.
    Warnings
None.
    Diagnostic Error Messages
None.
    Exit status
It always exits with status 0.
    Known bugs
None.
    Author(s)
    History
    Target users
    Comments