Definitions of variable in gdata.txt used for Poisson regression-
          ( see  ORNL-6785  Appendix for more details )


Col   Name Levels  Definition

  1   age          midpoint of five year age interval
  2   F      3     1= X10 only  2= Y12 only  3= Otheer
  3   XG    10     External exposure groups( mSv) 0 0-5 5-10 10-20 20-40 40-80
	               40-80 80-160 160-320 320-640 640+  
  4   IG     3     1=Not Monitored after 1951; 2=Monitored after 51; 3= Not Elg
  5   B      5     1= <1900  2=1900-10  3=1910-20  4=1920-30  5= 1930+
  6   S      2     1= Not monthly  2= monthly
  7   L      2     1= IF SUM OF JOBDAYS > 365 2= JOBDAYS<=365
  8   y1           Observed deaths for all cancer causes 
  9   e1           Expected deaths based on U.S. White Males Rates
 10   Dmrem        Average dose for cell in mrem--convert to Sv for analysis
 11   PY           Person-years