 Usage:  (erg)=anaabl(et,theta,os,hndl)  
 
 Input:

  et                     
                         
  theta                  
                         
  os                     
                         
  hndl                   
                         
 Output:

  erg                    
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
