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This  menu function provides the user by 
the following possibilities:
 1. to swicth ON/OFF the  QCD coupling defined in 
    particle distribution table;
 2. to define parameters of QCD coupling evolution 
    in case when the distribution table doesn't 
    contain  the corresponding information, or the 
    user refuses this opportunity;
 3. to define the QCD scale as function of phase 
    space point;
 4. to display the alpha(Q) plot in the region 
    specified  by the user.
