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  CompHEP calculates the QCD strong coupling parameter
as a function of the QCD parameter lambda6 and the Q^2
scale.
  This menu function calls the next-level menu which allows 
the user a to set a value of lambda6 and an expression 
for the momentum transferred Q^2.
  The QCD strong coupling is calculated at next-to
-next-to leading (NNLO) order (see 9.5a [*]). The value 
depends on the number of quarks (nf) with masses less than Q. 
The corresponding lambda_nf is calculated according to (9.7) [*].
   The scale of Q^2 may be defined either as a constant 
or as a squared sum of particle momenta, and in the following is
used as an argument of the parton distribution functions.
   If Q is defined as a constant, the corresponding value
of alpha=GG^2/(4*PI) is shown in the next level menu.  
   The alpha(s) plots for the region of 's' defined by the
user can be displayed. 

 [*] Review of Particle Physics, Eur.Phys.J. C15 (2000) 85
     http://pdg.lbl.gov/2001/contents_sports.html#stanmodeletc