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diff --git a/pkg/tbtables/fitsio/ftppru.f b/pkg/tbtables/fitsio/ftppru.f
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+C----------------------------------------------------------------------
+        subroutine ftppru(ounit,group,felem,nelem,status)
+
+C       set elements of the primary array equal to the undefined value
+
+C       ounit   i  Fortran output unit number
+C       group   i  number of the data group, if any
+C       felem   i  the first pixel to be written (this routine treats
+C                  the primary array a large one dimensional array of
+C                  values, regardless of the actual dimensionality).
+C       nelem   i  number of data elements to be set to undefined
+C       status  i  returned error stataus
+
+C       written by Wm Pence, HEASARC/GSFC, June 1991
+
+        integer ounit,group,felem,nelem,status,row
+
+C       the primary array is represented as a binary table:
+C               each group of the primary array is a row in the table,
+C               where the first column contains the group parameters
+C               and the second column contains the image itself
+        row=max(group,1)
+        call ftpclu(ounit,2,row,felem,nelem,status)
+        end