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                                     MRI.SUB.REQ.FLD
     i   2
 main
   req.fields

 Ì     i   2
main
[prefix]
&(E)ESBR[epx]

 Field Name                 Len Dat Typ  J  DPM            Offset/Local/VAL
 prefix                       2 FREE     L                 epx                                                         
 Ì   €   i   2
req.fields
[prefix,  req.field.num]
&(E)ESBR[epx]RF[esbrN]

 Field Name                 Len Dat Typ  J  DPM            Offset/Local/VAL
 req.field.num                2 PINT     R                 esbrN                                                       
 req.field                   25 FREE     L                 &(E)ESBR[epx]RF[esbrN]|0                                    

 Index Files                        Subscripts/Physical Base

 req.fields.x                       [prefix,req.field]
                                      ?(E)ESBRX[epx,esbrF]