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                                     BAR.PARAM
       2
     bar.param.age.index

 Ì       2
bar.param.age.index    (age.index) 
[mnemonic, age.days]
&BPARAM["AI",agi]

 Field Name                 Len Dat Typ  J  DPM            Offset/Local/VAL                                        
 age.days                     3 FREE     L                 agi                                                         
 age.bucket                   1 INT      R                 &BPARAM["AI",agi]